JPS61240231A - Display device of camera - Google Patents

Abstract

PURPOSE:To enter and display accurately and satisfactorily an ISO sensitivity by executing a display of date information and a display of film sensitivity information onto the same liquid crystal chip. CONSTITUTION:A liquid crystal (LCD) display plate which has been provided on a rear cover of a camera or the upper face of the camera not only executes a display of date display/film sensitivity information onto the same liquid crystal display plate, but also executes a display of a DC film decision display, the number of photographing sheets, a parity check, and a date inserting completion. Terminals SEG1a...SEGia, SEG1b...SEGnb of the liquid crystal denote terminals connected to each pattern segment of the liquid crystal, and correspond to the segments to which numbers of 1 through 43 have been given. To SEG1 b...SEGib of the liquid crystal LCD1 and LCD2, a data of a date (year, month, day, hour and minute) is inputted, the date is inserted, and simultaneously, this date information is displayed on a display part. Also, to SEGi+1b-SEGnb of the display use liquid crystal LCD2, other date than the date, namely, an ISO sensitivity, the number of photographing frames, DX, etc. are inputted, and its display is executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display device for a camera, and in particular, it is possible to display photographing date information such as date and the like on the film surface by TLC.
This invention relates to improvements in display devices for cameras.

[Conventional technology]

For date photography cameras that record date information such as the date and time of the photograph in one corner of the film screen along with the photographed scene, the date information is displayed on the back cover of the camera or on the top of the camera. It is now possible to display images using liquid crystal display boards.

On the other hand, as a film for cameras, a film with a 90X code (hereinafter referred to as DX film), which has a code for automatic detection on the outer barrel of the magazine, has been proposed and has started to appear. However, since conventional non-DX film also exists on the market, those who wish to take pictures should use DX film or non-DX film.
Load the X-film into the camera and take a picture. If your camera has built-in detection means for DX film, the camera will automatically set the ISO when you load DX film.
Exposure control is performed based on the sensitivity reading, but in the case of non-DX film, the user must set ISO sensitivity information.

For cameras that use only conventional non-DX film,
The ISO sensitivity is generally determined by aligning the knob of the ISO sensitivity display provided on the camera with the sensitivity scale, and then setting the nine sliding resistors inside the knob to a resistance value corresponding to the ISO sensitivity. This method of displaying and selecting ISO sensitivity is applicable to cameras that are digitally controlled or otherwise processed, or to DX film and non-DX film.
It is not suitable for cameras that use film together.

[Problem that the invention seeks to solve]

The present invention is applicable to cameras that can include date 3.
It is an object of the present invention to provide a display device for a camera in which sensitivity can be written and displayed clearly and satisfactorily.

[Means for solving problems]

The present invention aims to achieve the above-mentioned object, which is achieved by a camera display device characterized in that date information and film sensitivity information are displayed on the same liquid crystal chip.

〔Example〕

FIG. 1 shows an embodiment of the present invention. This embodiment shows a liquid crystal (LCD) display board installed on the camera back cover or the top surface of the camera.The same LCD display board also displays the date, φ film sensitivity information, DX film identification, number of shots, and bacteria information. It was also pressed to display the completion of the check and date 3.

FIG. 2 shows an embodiment showing the relationship between the liquid crystal display panel and the changeover switch shown in FIG. 1, and FIG. 3 shows the operation and operation of the changeover switch.

The display pattern is displayed by simultaneous driving of static driving and dynamic driving. FIG. 4 shows a relationship diagram of a control circuit, a control IC, and a changeover switch for combined static and dynamic driving. In the case of static drive, the coding is complicated, but the contrast of the pattern is increased during imprinting, making the characters clearer. In the case of dynamic drive, coding is simple, but it is not suitable for imprinting.

Therefore, in this embodiment, a combination of static and dynamic driving is used, and for the date, the LCD for monitoring and the L for photographing are used.
The CD is designed to be statically driven in parallel, and the portion of the LCD display panel shown in FIG. 1 in which the 0 to 0 digits are displayed in a white pattern is a data display section that is driven in parallel with the imprint section. This date clocks the crystal oscillation from the clock generator.
It is counted and operated by the control circuit ICCD as a reference signal.

Here, a circuit explanation will be given regarding one embodiment shown in FIG. The circuits include a latch circuit LTC that latches data from a control circuit IC (2) such as a microcomputer, a segment driver DR that drives the liquid crystal for imprinting and display, a liquid crystal LCD for date imprinting, and a liquid crystal LCD for display! , common signal generator COM (D) that sends a pulse signal to the common terminal of the liquid crystal.
, COM (S) and clock generator. LCD terminals 5EG1a -5EGla, 5EG1b・
...5EGnb indicates a terminal connected to each pattern segment of the liquid crystal, and 5EG1a...la, lb...
-nb corresponds to the segments numbered 1 to 43 in FIG. In the example of Figure 1, 1 to 34 correspond to 5EG1b to 5EGib in Figure 4, and 35
~43 corresponds to 5EGi + lb''-5EGnb.

Common signal CO from common signal generator COM (S)
M÷ is an unmodulated pulse wave as shown in the figure, but CO
The common signals C0M1 and C0M2 from M(9) are pulse waves modulated as shown in the figure, and C0M2 is COMI
% phase shift. As a result, all segments of the projection liquid crystal LCD and 5KGlb - SgGib of the display liquid crystal LCD are statically driven, and 5EGi + lb = 5EG of the display liquid crystal r and CDt.
nb is dynamically driven. Liquid crystal LCD5 and LC
'D,'s 5EG1b -5EGlb K Fi date (
The data (year, month, day, hour, minute) is input, and at the same time as the date is imprinted, this date information is displayed on the display section. Also a liquid crystal display LCD! 5EGi + l
b 5SEGnb K /d Data other than date i.e. I
Data such as SO sensitivity, number of photographed frames, DX, etc. are input and displayed. In the illustrated embodiment, data related to the date is common to the LCD 1 for imprinting and the LCD for display, so the segment terminals of each are connected in parallel to the driver, and the date segment of the LCD for display is also static. Although it is driven, the display liquid crystal LcDt
It is also possible to adopt a circuit configuration in which the date segment of the circuit is dynamically driven. Further, in the embodiment, the electrodes are provided only on the top and bottom of the liquid crystal plate, but if they are provided around the four circumferences of the liquid crystal plate, it is possible to increase the number of display types.

The LCD display board shown in FIG. 1 is capable of displaying dates as well as displaying DX and non-DX compatible displays. When a DX detection means such as an electric contact piece provided in the film chamber of the camera detects a DX film, the information is input to a control IC, and a DX display is made on an LCD display panel by dynamic (COMI) driving. In addition, the RSO sensitivity display (8 types from 25 to 1600) on the DX detection LCD display board is pattern■■■■
displayed by.

■ displays only 11', ■ displays only @01, part of the date display and film sensitivity display are displayed in a common pattern, and the ■ and ■ displays are dynamic (C0M2
) This is done by driving.

The LCD display board also displays a film counter (0 to 39
)t- also has the function of performing. Pattern ■0 is for displaying this, and is dynamic (COMI,
By driving C0M2), an addition display is made as the shooting winds up.

This LCD display board is designed to display PRI for a certain period of time by dynamic (COMI) drive when the control IC receives a signal indicating the completion of the date shot, thereby displaying the completion of the date shot. It is said that

Further, when the battery check means provided in the camera detects a drop in the voltage of the battery power source, the control IC changes the entire display on the LCD display board to a blinking flash display. Fludge
Under the display conditions, the photo LCD is also in the flash display state, so when the flash display is in the warning state, the control IC prevents the date photo lamp from lighting up even if the date photo mode is set. Control.

The O5M0DE and 5ISO switches for selection and the BY, SM, and SD buttons for change shown in Figure 2 related to this LCD display board are connected to the control circuit IC shown in Figure 4.
Q)) is connected. These switches will be explained with reference to the switch operation and operation diagram t-@3.

The 5M0DE switch is a switch for changing the date display, and by pressing the 5M0DE switch, the cycle changes from year, month, day to day, hour, minute to OFF (no display).

SY, SM, and SD8II are correction buttons that, when pressed, cause the corresponding display section to add 1, and the correction is made in the year/month/day or day/hour/minute mode.

The 19Iso switch is a switch for displaying the ISO sensitivity, and the I80 sensitivity is displayed only while the 5ISO switch is pressed. However, when the camera is in DX mode with built-in DX film, the 5ISO switch is disabled.

5Release the ISO switch to return to the original mode from the ISO sensitivity lighting mode. When the DX detection means detects non-DX film 17 after opening and closing the back cover of the camera, the ISO mode automatically flashes for a certain period of time to request confirmation or change of ISO sensitivity. The ISO sensitivity displayed in the pattern ■■■■ can be changed in ISO mode by pressing the SD button, which is also used for changing the date, from 25 → 64 → 80.
→100→200→400→1000→1600→25
...The ISO sensitivity value changes.

IS set in non-DX mode in this way
The O sensitivity information is transmitted to the main body control IC, and the exposure during photographing and the lamp lighting time during date photography are controlled.

That is, as shown in FIG. 4, the ISO sensitivity information is transmitted from the control circuit IC (2) provided on the camera back cover to the main body control IC on the camera main body side by serial transfer using 1 bit.

The main body control IC 1j reads the above-mentioned ISO sensitivity information transferred from the date imprint control IC, reads information from the photometry circuit, controls the automatic exposure control circuit, and provides proper exposure.

Also, in the case of flash photography, the flash photography control circuit is similarly controlled based on ISO sensitivity information transferred from the control IC to provide proper exposure. In this case, the control IC inputs and calculates the information from the distance detection circuit and the date 3 IC, and the strobe photography control circuit inputs the strobe trigger pulse t.
It is desirable to control the exposure so that it occurs at the timing of −A, and depending on this timing, the aperture of the diaphragm changes, thereby providing appropriate exposure.

Further, the control circuit changes the lighting time of the photography lamp according to the ISO sensitivity information during date photography, and controls the lamp driver so that the date information of the appropriate exposure amount is recorded on the film.

〔Effect of the invention〕

The present invention, in which at least a date display and an ISO sensitivity display are displayed on the same liquid crystal chip, improves the operability of the camera and eliminates the necessary precautions for photographers. : A display device for a camera that is both evocative and does not require unnecessary memory, and is also excellent in economical efficiency, has been provided.

[Brief explanation of drawings]

FIG. 1 shows a liquid crystal display panel showing one embodiment of the present invention. FIG. 2 is an embodiment showing the relative positions of the liquid crystal display panel and the changeover switch shown in FIG. 1. FIG. 3 shows the operation and operation of the changeover switch. FIG. 4 shows a control and switch operation circuit for combined static and dynamic driving.

Claims (6)

[Claims] (1) A camera display device characterized in that date information and film sensitivity information are displayed on the same liquid crystal chip. (2) The display device for a camera according to claim 1, wherein the film sensitivity information is used for both date shooting and exposure control. (3) Each of the film sensitivity information mode selection means and the film sensitivity information changing means is also used for the date information.
Display device for the camera described in Section 1. (4) The camera according to claim 1 or 2, characterized in that the film sensitivity information mode selection means is set independently, and the film sensitivity information changing means is also used as a date information changing means. Display device. (5) The display device for a camera according to claim 3 or 4, wherein film sensitivity information is displayed only when the film sensitivity information mode is selected. (6) A two-digit number pattern for displaying the year, month, day, hour, or minute for displaying the date information is used as a part for displaying the film sensitivity information. A display device for a camera according to item 5.