EP0266793A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Rear converter for interchangeable lens camera
Assignee: Pentax Corp
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Filing: 1987-11-06
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Granted: —
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Expires: 2007-11-06
Abstract
Abstract A rear converter (611) for use between a detachable photographing lens (71) and a camera body (101) which can be used with both AE (automatic exposure) and AF (autofocusing) lenses and camera bodies. One example of the converter (611) according to the present invention includes a body mount (613) matable with a camera body mount; a lens mount (615) matable with a photographing lens mount of a photographing lens (71); a lens system (617) including an automatic focusing movable lens (616); storing means (619) for storing at least characteristic data for said rear converter (611); a first group (675) of electrical contacts provided on said body mount (613), said first group (675) of electrical contacts being capable of electrically contacting with electrical contacts (175) provided on said camera body mount; a second group (775) of electrical contacts provided on said lens mount (615) for transmitting a signal for identifying said photographing lens (71) to said storing means (619), said second group (775) of electrical contacts being capable of electrically contacting with electrical contacts (75) provided on said photographing lens mount; a first electrical contact (677) provided on said body mount (613); a second electrical contact (777) provided on said lens mount (615) and grounded electrically; and driving force transmitting means (623) for transmitting driving force from said camera body to said movable lens (616).
Inventors
- 👤 Masahiro C/O Asahi Kogaku Kogyo K. K. Kawasaki
- 👤 Osamu C/O Asahi Kogaku Kogyo K. K. Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:00
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04; G03B19/07; G03B17/00; G03B17/02; G03B17/12; G03B17/14; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
200 words
A rear converter comprising: a body mount (613) matable with a camera body mount (103) of a camera body (101); a lens mount (615) matable with a photographing lens mount (85; 17) of a photographing lens (71, 15); a lens system (617) including an automatic focusing movable lens (616); storing means (619) for storing at least characteristic data for said rear converter; a first group (675) of electrical contacts provided on said body mount (613), said first group (675) of electrical contacts being capable of electrically contacting with electrical contacts (175) provided on said camera body mount (103); a second group (775) of electrical contacts provided on said lens mount (615) for transmitting a signal for identifying said photographing lens (71, 15) to said storing means (619), said second group (775) of electrical contacts being capable of electrically contacting with electrical contacts (75; 21, 22, 23) provided on said photographing lens mount (85; 17); a first electrical contact (677) provided on said body mount (613); a second electrical contact (777) provided on said lens mount (615) and grounded electrically; and driving force transmitting means (623) for transmitting driving force from said camera body (101, 21) to said movable lens (616).
Claim 2
Dependent Claim
200 words
A rear converter comprising: a body mount (613) matable with a camera body mount (103) of a camera body (101); a lens mount (615) matable with a photographing lens mount (85; 17) of a photographing lens (71, 15); a lens system (617) including an automatic focusing movable lens (616); storing means (619) for storing at least characteristic data for said rear converter; a first group (675) of electrical contacts provided on said body mount (613), said first group (675) of electrical contacts being capable of electrically contacting with electrical contacts (175) provided on said camera body mount (103); a second group (775) of electrical contacts provided on said lens mount (615) for transmitting a signal for identifying said photographing lens (71, 15) to said storing means (619), said second group (775) of electrical contacts being capable of electrically contacting with electrical contacts (75; 21, 22, 23) provided on said photographing lens mount (85; 17); a first electrical contact (677) provided on said body mount (613); a second electrical contact (777) provided on said lens mount (615) and grounded electrically; and driving force transmitting means (623) for transmitting driving force from said camera body (101, 21) to said movable lens (616).
Claim 3
Dependent Claim
221 words
A rear converter comprising: a body mount (613) matable with a camera body mount (103, 203) of a camera body (101, 211); a lens mount (615) matable with a photographing lens mount (85, 217) of a photographing lens (71, 215); a fixed lens system for changing the focal length of said photographing lens (71, 215); storing means (619) for storing at least characteristic data of said fixed lens system; a first group (675) of electrical contacts provided on said camera body mount (103, 203) and respectively connected to different signal terminals of said storing means (619), said first group (675) of electrical contacts being capable of electrically contacting with electrical contacts provided on said camera body mount (103, 203); a first electrical contact (677) provided on said body mount (613); a second group (775) of electrical contacts provided on said lens mount (615) and connected to said first group (675) of electric contacts, said second group (775) of electrical contacts being capable of electrically contacting with electrical contacts (75; 221, 222, 223) provided on said photographing lens mount (85, 217); a second electrical contact (777) provided on said lens mount (615) and connected to said first electrical contact (677); and driving force transmitting means (623) for transmitting driving force from said camera body (101, 211) to said photographing lens (71, 215).
Claim 4
Dependent Claim
221 words
A rear converter comprising: a body mount (613) matable with a camera body mount (103, 203) of a camera body (101, 211); a lens mount (615) matable with a photographing lens mount (85, 217) of a photographing lens (71, 215); a fixed lens system for changing the focal length of said photographing lens (71, 215); storing means (619) for storing at least characteristic data of said fixed lens system; a first group (675) of electrical contacts provided on said camera body mount (103, 203) and respectively connected to different signal terminals of said storing means (619), said first group (675) of electrical contacts being capable of electrically contacting with electrical contacts provided on said camera body mount (103, 203); a first electrical contact (677) provided on said body mount (613); a second group (775) of electrical contacts provided on said lens mount (615) and connected to said first group (675) of electric contacts, said second group (775) of electrical contacts being capable of electrically contacting with electrical contacts (75; 221, 222, 223) provided on said photographing lens mount (85, 217); a second electrical contact (777) provided on said lens mount (615) and connected to said first electrical contact (677); and driving force transmitting means (623) for transmitting driving force from said camera body (101, 211) to said photographing lens (71, 215).
Claim 5
Dependent Claim
21 words
The rear converter as defined in claims 1 or 2 wherein said storing means (619) is a read only memory (ROM).
Claim 6
Dependent Claim
120 words
The rear converter as defined in claims 1 or 2 further comprising: a third group (679) of electrical contacts provided on said body mount (613), said third group (679, of electrical contacts being capable of electrically contacting with electrical contacts provided on said camera body (101, 211) or camera body mount (103, 203) respectively; and a fourth group (779) of electrical contacts provided on said lens mount (615), said fourth group of electrical contacts being capable of electrically contacting with electrical contacts provided on said photographing lens (71, 15, 215) or photographing lens mount (85, 17, 217) respectively, data representing a minimum lens stop value being transmitted from said photographing lens (71, 15, 215) to said camera body (101, 211).
Claim 7
Dependent Claim
27 words
The rear converter as defined in claim 4 wherein said data representing a minimum lens stop value is transmitted through said third and fourth groups (679, 779).
Claim 8
Dependent Claim
61 words
The rear converter as defined in claims 1 or 2 further comprising: a third electrical contact (681) provided to said body mount (613); and a fourth electrical contact (781) provided to said lens mount (615), data representing change-over between automatic exposure control and manual exposure control being transmitted from said photographing lens (71, 15, 215) to said camera body (101, 211).
Claim 9
Dependent Claim
36 words
The rear converter as defined in claims 1 or 2 wherein said first and second electrical contacts (677, 777) are capable of projecting from planes of said body mount (613) and said lens mount (615), respectively.
Claim 10
Dependent Claim
44 words
The rear converter as defined in claim 6 wherein said third electrical contact (681) is capable of projecting from a plane of said body mount (613) and said fourth electrical contact (781) is incapable of projecting from a plane of said lens mount (615).
Claim 11
Dependent Claim
79 words
The rear converter as defined in claim 3 wherein said ROM (619) is assigned by the signal representing an open lens-stop value of said photographing lens (71, 15, 215) which is transmitted through said second group (775) of electrical contacts from said photographing lens (71, 15, 215), and data which is stored at an address assigned by the signal in said ROM (619) is transmitted through said first group (675) of electrical contacts to said camera body (101; 211).
Claim 12
Dependent Claim
58 words
The rear converter as defined in claims 1 or 2 wherein electrical contacts which are provided on said camera body (101, 211) to receive data representing a minimum lens stop value, are grounded through said body mount (613) of said rear converter, so that a predetermined minimum lens stop value is set to said camera body (101, 211).
Claim 13
Dependent Claim
34 words
The rear converter as defined in claim 6 wherein said data representing change-over between automatic exposure control mode and manual exposure control mode is transmitted through said third and fourth electrical contacts (681, 781).
Claim 14
Dependent Claim
53 words
The rear converter as defined in claim 3 wherein said storing means (619) further comprises means (688) for producing a switching signal to control an operation of said ROM (619) so that data read out from said ROM (619) is transmitted to said camera body (101, 211) without interference with the other data.
References Cited (Backward Citations)
No citation records indexed.
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