Patent US3604795A successfully refreshed from Google Patents.
US3604795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image projection system
Assignee: Eastman Kodak Co
•
Filing: 1968-05-20
•
Granted: 1971-09-14
•
Expires: 1988-05-20
Abstract
Abstract Apparatus is disclosed for projecting an image onto a display surface with varying degrees of magnification and having the capability of selectively projecting various portions of the image. This apparatus is capable of incorporating a plurality of different lenses and illustratively includes a reflective surface, which is movably mounted to increase or decrease the long conjugate distance between the lens and the display surface. The selected lens is inserted within the apparatus at its given focal distance from the transparency to be projected and is manipulated by a follow focus mechanism to maintain the projected image in focus as the reflected surface is being moved.
Inventors
- 👤 Robert P Crandall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:43
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11; G03B37/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
An image projection system for projecting an image from an information bearing medium onto a surface including; means for interchangeably incorporating a plurality of lenses, reflecting means disposed to direct the image derived from one of the plurality of lenses onto the surface, means for selectively varying the position of said reflecting means to vary the long conjugate distance between the one lens and said surface, and follow focus means responsive to the position of said reflecting means to vary the position of said support means and said one lens to substantially maintain the image in focus upon the surface, said follow focus means including a first cam member affixed to said reflecting means, a second cam member having a camming surface corresponding to each of the plurality of lenses a lever disposed to follow the motion of said first cam member, and rod means for transferring said motion from said lever to said second cam member.
Claim 2
Dependent Claim
157 words
An image projection system for projecting an image from an information bearing medium onto a surface including; means for interchangeably incorporating a plurality of lenses, reflecting means disposed to direct the image derived from one of the plurality of lenses onto the surface, means for selectively varying the position of said reflecting means to vary the long conjugate distance between the one lens and said surface, and follow focus means responsive to the position of said reflecting means to vary the position of said support means and said one lens to substantially maintain the image in focus upon the surface, said follow focus means including a first cam member affixed to said reflecting means, a second cam member having a camming surface corresponding to each of the plurality of lenses a lever disposed to follow the motion of said first cam member, and rod means for transferring said motion from said lever to said second cam member.
Claim 3
Dependent Claim
25 words
An image projection system as claimed in claim 1, wherein said rod means is flexibly biased to engage said lever with said first cam member.
Claim 4
Dependent Claim
113 words
An image projection system as claimed in claim 1, which additionally includes fine focus means associated with said follow focus means for further adjusting the position of the incorporated one of the plurality of lenses to ensure that the image is in focus upon the surface, said fine focus means including a bearing having a threaded portion for imparting rectilinear motion to said camming surfaces of said second cam member and a rotatable member having a threaded portion which is threadably received by said bearing, said bearing having a surface of substantially spherical configuration for allowing said follow focus means to be disengaged from said means for interchangeably incorporating a plurality of lenses.
Claim 5
Independent Claim
189 words
A system for projecting an image from an object onto a focal surface including; a first carriage for interchangeably receiving a plurality of lenses, a second carriage including at least one reflective surface for directing the image onto the focal surface, a cam member secured to said second carriage, said first and second carriages being movably mounted with respect to the object, and a follow focus system responsive to the position of said second carriage for varying the position of said first carriage to maintain the projected image in focus upon the focal surface, said follow focus system including, lens-positioning means cooperably connected to said first carriage and having a camming surface corresponding to each one of the plurality of lenses for positioning the corresponding lens with respect to the object and for contrOlling the movement of said first carriage when one of the plurality of lenses is incorporated within said system, a lever flexibly biased against said cam member, and a follow focus rod to which said lever is secured, said follow focus rod being connected to said lens-positioning means to impart rotational motion to said lens-positioning means.
Claim 6
Independent Claim
189 words
A system for projecting an image from an object onto a focal surface including; a first carriage for interchangeably receiving a plurality of lenses, a second carriage including at least one reflective surface for directing the image onto the focal surface, a cam member secured to said second carriage, said first and second carriages being movably mounted with respect to the object, and a follow focus system responsive to the position of said second carriage for varying the position of said first carriage to maintain the projected image in focus upon the focal surface, said follow focus system including, lens-positioning means cooperably connected to said first carriage and having a camming surface corresponding to each one of the plurality of lenses for positioning the corresponding lens with respect to the object and for contrOlling the movement of said first carriage when one of the plurality of lenses is incorporated within said system, a lever flexibly biased against said cam member, and a follow focus rod to which said lever is secured, said follow focus rod being connected to said lens-positioning means to impart rotational motion to said lens-positioning means.
Claim 7
Dependent Claim
137 words
An image projection system for projecting an image from an object onto a focal surface, comprising support means for interchangeably incorporating a selected lens from a plurality of lenses, reflecting means for directing the image onto the focal surface, means for selectively varying the position of said reflecting means to vary the long conjugate distance between the selected lens and the focal surface, and a follow focus system including a first cam member affixed to said support means, a lever for following the movement of said first cam member, a second cam member, and a linking member for coupling said first and second cam members, said second cam member having a cam surface for each of the plurality of lenses for providing a follow focus movement corresponding to the selected lens incorporated with said system for projecting.
Claim 8
Dependent Claim
137 words
An image projection system for projecting an image from an object onto a focal surface, comprising support means for interchangeably incorporating a selected lens from a plurality of lenses, reflecting means for directing the image onto the focal surface, means for selectively varying the position of said reflecting means to vary the long conjugate distance between the selected lens and the focal surface, and a follow focus system including a first cam member affixed to said support means, a lever for following the movement of said first cam member, a second cam member, and a linking member for coupling said first and second cam members, said second cam member having a cam surface for each of the plurality of lenses for providing a follow focus movement corresponding to the selected lens incorporated with said system for projecting.
Claim 9
Dependent Claim
46 words
An image projection system as claimed in claim 5, wherein each of said cam surfaces is disposed a distance from the object to ensure that the image is substantially in focus upon the focal surface when the selected lens is incorporated within said system for projecting.
Claim 10
Dependent Claim
22 words
An image-projecting system as claimed in claim 6, wherein said distance is approximately equal to the focal length of the selected lens.
Claim 11
Dependent Claim
25 words
An image-projecting system as claimed in claim 7, wherein said support means includes a member which is selectively engageable with one of the cam surfaces.
Claim 12
Dependent Claim
151 words
Apparatus for projecting an image onto a focal surface, said apparatus including: a. lens means; b. means movably mounted with respect to said lens means for varying the long conjugate distance between said lens means and the focal surface; c. drive means for imparting a first displacement along a rectilinear path to said means for varying; and d. follow focus means responsive to the first displacement of said means for varying for imparting a second displacement as a nonlinear function of the first displacement to said lens means to maintain the image in focus upon the focal surface, said follow focus means including a cam member affixed to said means for varying and having a cam surface and a member rotatably mounted about an axis, said last mentioned member being biased to follow the movement of said cam surface, said surface including a straight line skewed with respect to said axis.
Claim 13
Dependent Claim
151 words
Apparatus for projecting an image onto a focal surface, said apparatus including: a. lens means; b. means movably mounted with respect to said lens means for varying the long conjugate distance between said lens means and the focal surface; c. drive means for imparting a first displacement along a rectilinear path to said means for varying; and d. follow focus means responsive to the first displacement of said means for varying for imparting a second displacement as a nonlinear function of the first displacement to said lens means to maintain the image in focus upon the focal surface, said follow focus means including a cam member affixed to said means for varying and having a cam surface and a member rotatably mounted about an axis, said last mentioned member being biased to follow the movement of said cam surface, said surface including a straight line skewed with respect to said axis.
Claim 14
Dependent Claim
42 words
An image projection system as claimed in claim 9, wherein said straight line is so skewed with respect to said axis that the distance between said straight line and said axis decreases as a function of the distance from said lens means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |