JPS5640817A - Display device for camera using electrochromic cell - Google Patents
Display device for camera using electrochromic cellInfo
- Publication number
- JPS5640817A JPS5640817A JP11778179A JP11778179A JPS5640817A JP S5640817 A JPS5640817 A JP S5640817A JP 11778179 A JP11778179 A JP 11778179A JP 11778179 A JP11778179 A JP 11778179A JP S5640817 A JPS5640817 A JP S5640817A
- Authority
- JP
- Japan
- Prior art keywords
- film
- displaying
- power consumption
- low power
- coloring
- 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.)
- Pending
Links
Landscapes
- Indication In Cameras, And Counting Of Exposures (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
PURPOSE: To make electrical displaying of the number of photographed sheets, film length, etc. with low power consumption by making use of the coloring display holding characteristics of an electrochromic cell.
CONSTITUTION: When the step count value of a decimal counter or the like is applied to a decoder at every film winding, the signal such as seven bits of binary value according to the number of films is generated and the positive and negative pulses corresponding to the bit value of the binary bit signal are formed through a pulse generating circuit, differentiating circuit, etc. These pulses drive switching transistors Tr1... via inverters IN1, IN2... are directly drive switching transistors Tr8.... This causes decoloring current to be applied to the electrochromic cells (a), (b)... corresponding to 7 segments, etc. for displaying so that the display by the cells (a), (b)... of which the coloring is temporarily maintained by the current application are decolored. Hence, the number of photographed sheets, film length, film sensitivity, etc. may be electrically displayed with symbols, numerical values, etc. with low power consumption without using any intricate mechanical mechanism.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11778179A JPS5640817A (en) | 1979-09-13 | 1979-09-13 | Display device for camera using electrochromic cell |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11778179A JPS5640817A (en) | 1979-09-13 | 1979-09-13 | Display device for camera using electrochromic cell |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5640817A true JPS5640817A (en) | 1981-04-17 |
Family
ID=14720151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11778179A Pending JPS5640817A (en) | 1979-09-13 | 1979-09-13 | Display device for camera using electrochromic cell |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5640817A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4555170A (en) * | 1984-01-23 | 1985-11-26 | Asahi Kogaku Kogyo Kabushiki Kaisha | Device for illuminating display unit in viewfinder |
US4731630A (en) * | 1985-06-17 | 1988-03-15 | Nippon Kogaku K. K. | Display device |
JPH01152443A (en) * | 1988-11-10 | 1989-06-14 | Minolta Camera Co Ltd | Camera with lens cover |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50120332A (en) * | 1974-03-04 | 1975-09-20 |
-
1979
- 1979-09-13 JP JP11778179A patent/JPS5640817A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50120332A (en) * | 1974-03-04 | 1975-09-20 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4555170A (en) * | 1984-01-23 | 1985-11-26 | Asahi Kogaku Kogyo Kabushiki Kaisha | Device for illuminating display unit in viewfinder |
US4731630A (en) * | 1985-06-17 | 1988-03-15 | Nippon Kogaku K. K. | Display device |
JPH01152443A (en) * | 1988-11-10 | 1989-06-14 | Minolta Camera Co Ltd | Camera with lens cover |
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