JPS5627111A - Optical device of constant magnification - Google Patents
Optical device of constant magnificationInfo
- Publication number
- JPS5627111A JPS5627111A JP10247479A JP10247479A JPS5627111A JP S5627111 A JPS5627111 A JP S5627111A JP 10247479 A JP10247479 A JP 10247479A JP 10247479 A JP10247479 A JP 10247479A JP S5627111 A JPS5627111 A JP S5627111A
- Authority
- JP
- Japan
- Prior art keywords
- optical system
- imaging optical
- projecting
- film
- plane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Lenses (AREA)
- Projection Apparatus (AREA)
Abstract
PURPOSE: To enable the projection at always a constant magnification even if the distance from the projecting optical system up to the projected position changes by moving at least two partial optical systems constituting the imaging optical system in the predetermined relation.
CONSTITUTION: The lens groups I and IV constituting the imaging optical system are stationary and the moving extents (s), (t) of the lens groups II and III satisfy the formulas 1, 2, whereby the lens back is made variable in the state that its imaging magnification is held constant. Here, the 1st face opposes to a light source or film plane and the 10th face opposes to the projecting plane. When this optical device is adapted to a slide projector, the 1uminous flux from the light source is condensed by a condenser lens and passes through the film, thereby forming the image of the light source at the incident pupil of the imaging optical system. The film plane and the projecting plane are in optically conjugate positions with respect to the imaging optical system and even if the spacing between the imaging optical system and the projecting plane changes, the image of the film is formed on the projecting surface at a constant magnification.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10247479A JPS5627111A (en) | 1979-08-10 | 1979-08-10 | Optical device of constant magnification |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10247479A JPS5627111A (en) | 1979-08-10 | 1979-08-10 | Optical device of constant magnification |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5627111A true JPS5627111A (en) | 1981-03-16 |
JPH0113084B2 JPH0113084B2 (en) | 1989-03-03 |
Family
ID=14328444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10247479A Granted JPS5627111A (en) | 1979-08-10 | 1979-08-10 | Optical device of constant magnification |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5627111A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5111675U (en) * | 1974-07-11 | 1976-01-28 | ||
JPS5358231A (en) * | 1976-11-08 | 1978-05-26 | Honeywell Inc | Device for correcting focal size |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5111675B2 (en) * | 1971-10-28 | 1976-04-13 |
-
1979
- 1979-08-10 JP JP10247479A patent/JPS5627111A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5111675U (en) * | 1974-07-11 | 1976-01-28 | ||
JPS5358231A (en) * | 1976-11-08 | 1978-05-26 | Honeywell Inc | Device for correcting focal size |
Also Published As
Publication number | Publication date |
---|---|
JPH0113084B2 (en) | 1989-03-03 |
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