JPS6289029A - Character imprinting device for camera - Google Patents

Abstract

PURPOSE:To imprint display picture elements of large capacity in a film by lowering driving duty of a liquid crystal panel by a selector circuit and a liquid crystal driving circuit. CONSTITUTION:When imprinting in a film, one shot pulse comes out to lamp input 43 and resets a counter 1, and accordingly, AND gates 2-5 become H every 125ms, and COM outputs 21-24 are selected successively. At this time, a latch consisting of NOR gates 28, 29 is set, and a signal of 8Hz 36 appears in output 30a of an AND gate 30. At a point of time, when selection of COM output is completed throughly, 1Hz 39 rises to H, and thereby the latch is reset, and the signal 30a is kept L. The signal 30a lights up a lamp 31 by a transistor 32, and light is emitted 62.5ms in every period which each COM output is selected, and imprinting is completed on the whole screen of a liquid crystal panel 44.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a character imprinting device for a camera that imprints characters, etc. onto the film of a camera.

[Summary of the invention]

The present invention provides a character imprinting device for a camera, which includes a liquid crystal panel consisting of N scanning 4tifii, a selection (b) path for sequentially selecting the scanning electrodes at an arbitrary period, and a selection path for sequentially selecting the scanning electrodes at an arbitrary period. J1+, a liquid that drives at 1/M duty so as to turn on and turn off unselected scan electrodes;
By the configuration of the drive and the light source driving circuit that causes the light source to emit light for a certain period of time in each selected period, display segments corresponding to N scanning electrodes are sequentially displayed at a duty of 1/M, and each time a transparent image is projected on the film. Expose to light to obtain the effect of imprinting characters.

In other words, 1 of the high-quality page is better than the 1/N duty-7 drive.
/M Duty 1 drive CM<N) enables large-capacity display imprinting.

[Prior art]

Conventionally, %A 1982-15698'2 or JP-A-1983
As shown in No. 172,640, the basic structure is the same as that of the present invention, and the former is a liquid crystal panel coated with a metal film, while the latter uses a guest-host liquid crystal to improve imprint quality. However, the driving method of the liquid crystal is not mentioned, and display is usually performed by static driving. Furthermore, there is an example in which light emitting elements such as LEDs are sequentially scanned and turned on as shown in Japanese Utility Model Publication No. 11155/1983.

[Problems and objects to be solved by the invention] However, when using a liquid crystal panel in the prior art, static drive or A-duty drive is the limit due to the display quality of the liquid crystal, and the number of display segments is small. There was a problem in that it was difficult to imprint characters, graphic figures, etc.

In addition, when the number of display pixels is increased using LEDs, there is a problem that the arrangement becomes complicated, the device becomes thicker, and the cost increases, making it impractical for practical use.

The present invention is intended to solve these problems, and its purpose is to imprint characters, figures, etc. onto a film with a simple arrangement.

[Means for solving problems]

A character imprinting device for a camera that has a light source and a liquid crystal panel and imprints characters or figures corresponding to the display on the liquid crystal panel onto a film, the character imprinting device for a camera having the following configuration. equipment loaf.

a) A liquid crystal panel in which a display segment is composed of N scanning electrodes (N is a positive number of 3 or more) and a plurality of signals; b) At least one scanning electrode is sequentially connected to the scanning electrodes at an arbitrary period. Selection circuit to choose.

C) The display segment corresponding to the scan fri pole selected by the selection circuit lights up the necessary pattern, and the display segment corresponding to the unselected scan: d) a light source drive circuit that causes the light source to emit light for a certain period of time every arbitrary period in which the scanning electrodes are sequentially selected.

[Effect]

With the above configuration, light from the light source passes through the liquid crystal panel to expose the film to an image corresponding to the display on the liquid crystal panel. Therefore, the display contrast ratio of the liquid crystal panel determines the imprint quality. The effective voltage margin for lighting and non-lighting in R with 1/N duty drive is 110N/VOF p −L a”+N 1 )/(
(*-2)"+N-1) (& is the bias value) Here, select the running fit pole of M CMAN) and 1/M
When duty driving is performed and a non-selection drive signal is applied so that the other scan electrodes are turned off to all signal electrodes,
The above-mentioned effective wake-up pressure margin becomes larger than that during i/N duty driving in a-2, and the display contrast ratio of the liquid crystal increases.

At this time, when the light source is turned on for a certain period of time, only the display segment of the selected scanning electrode is imprinted on the film.
(The polarizing plate is set so that the lighted segments transmit the light from the light source and the non-lighted segments are cut off.) After that, sequentially select the scanning electrodes and perform the above imprinting operation at least N/M times. Imprinting of the entire display is possible with a liquid crystal display contrast ratio of 1/M duty drive.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. FIG. 1 shows an embodiment in which four scanning electrodes are selected one by one and driven with a weight duty.

Scanning electrodes (hereinafter referred to as COM) 21 to 24 and signal electrodes (
(hereinafter referred to as segments) 25-27, a selection circuit consisting of counter 1 and AND gates 2-5, a liquid crystal drive circuit consisting of C0vi drivers 14-17 and segment drivers 18-20, NOR
Game) 28, 29° AND gate 30. transistor 3
2 and a lamp 31 as a light source.

The C0M driver operates by selecting φ64 (64 Hz signal), φ64 (inverted 64 Hz signal), φ32 (32 Hz signal), and -1, 5v by the transduction gates 6 to 9, respectively. In addition, the segment driver is φ64. φ64. φ
32. It operates under the control of φ32 (inversion of 32Hz signal).

Hereinafter, the operation of the circuit shown in FIG. 1 will be explained using FIGS. 2 and 3. FIG. 2 is a timing diagram of the A duty pivot circuit. Input clock 33Vij 28Hz or higher signal is divided by counter 1, and AC signal 64Hz for driving the liquid crystal.54. Obtain 32Hz35. COM
The on signal 45 has a 00M output waveform when selected and is obtained by setting the inputs of the C0M drivers 14 to 170 in FIG. 1 to H, and the C0Moff signal 46 has a 00M output waveform when not selected and is obtained from the input LK. S@gon lci No. 4
7 lights up in response to COM o n signal 45, and C0Mof
The segment output waveform is not turned on for the f signal 46, and is turned on when the signal inputs 40 to 42 of the segment drivers 18 to 20 in FIG. 1 are high. Further, the Segoff signal 48 has a non-lighting waveform and is output when the signal input is L.

Therefore, select 00M output 21 in Figure 1 and COM o
If you output the n signal 45 and the COM o f f signal, the segment output 2 corresponding to the 00M output 21
5 to 27 lights up arbitrarily, 00M output 22 to 2
Display 4 can be turned off. Thereafter, select the 00M output one after another and scan the plan (j).

Next, the selection of the KCOM output and the timing of light emission will be explained in detail. FIG. 5 shows the timing of lamp drive. Clock signal 4Hz37 and 2 divided by counter 1
Hz38 and when each is (L, L), AND
AND when the output 2a of gate 2 is I(, (H, L)) AND when the output 3a of gate 5 is H, (L, H) AND when the output 4a of gate 4 is H, (H,)i) Output 5a of gate 5 becomes H. Since the outputs of the AND gates 2 to 5 are the human power of the 00M drivers 14 to 17, when the output of the AND gate is H, the corresponding C0M output is selected. When imprinting on film, a one-shot pulse is output to the lamp input 45 to reset the counter 1, so the AND gates 2 to 5 become H at 125m5aa'lIg, and the C0M outputs 21 to 24 are sequentially selected. At this time, a launch consisting of NOR gates 28.degree. and 29 is set, and a signal of 8Ht56 appears at the output 50m of AND gate 3a.

When the selection of the C0M output is completed, 1Hz69 rises to H, so the launch is reset and 30a is also held at L. The signal 30a causes the lamp 61 to be turned on by the transistor 52, and in the end, each COM output emits light at VC62, 5m5ec each time the lamp is selected, and the imprinting of the entire screen of the liquid crystal panel 44 is completed. ,
The selection period and the light emission period are determined based on the sensitivity of the film, the responsiveness of the liquid crystal, etc., and representative values are shown here. Furthermore, the light emission duty greatly depends on the illuminance of the light source, and a duty of 100% (continues to emit light solidly until the end of the selection cycle) is also possible.

In the above embodiment, COM is selected one by one, but it may be selected every several lines to shorten the imprinting time.

Figure 8g4 is a timing diagram of a method in which m C0Ms are sequentially selected and driven with a 17M duty.

50 of C0M1. 51 of C0M2. From COMrn 5
Select up to 2 at the same time and output the waveform shown in the figure. At this time, the remaining (N -rn) COMs contain C0Moff55.
If you output this, it will turn off. One cycle is N/
The process ends with m + 1 or less selections. Figure 5 shows another C0M
This shows a method of A7″ knee-to-drive using waveforms.

60 of C0M1 and 61 of C0M2 are the selected waveforms, C0
Moff62 is a non-selected waveform. The segment output at this time is (0,0) is 63 for C0M1 and C0M2.
．． (0°1) is 64. (1, f) is 65. (f,
Q) is 66. (0 indicates not lit, 1 indicates lit.)
[Effects of the Invention] The present invention reduces the driving duty of the liquid crystal panel by using the selection circuit and the liquid crystal 1 pivot circuit, so that it is possible to imprint a large volume of display pixels on the film, and it is possible to print characters, figures, etc. This has the effect of greatly expanding imprinted information. For example, to imprint 10 characters (1 character 16 x 161iIiii elements), the conventional example requires 1280 LCD panels (2 common and segment), but with the same quality (A duty - oscillation). This is possible with 16 commons and 160 segments.

Furthermore, even within the range of display capacity possible with conventional technology, the number of electrodes on the liquid crystal panel, display output pads on the IC, circuit board patterns, etc. are reduced, making it possible to reduce costs and make the device smaller and thinner. It becomes possible to

Furthermore, with the selection circuit, light source, and drive circuit of the present invention, 1
In the 1st scan, select the 3rd pole while printing,
By varying the selection period or the light emitting period of the scanning electrode, it is possible to create a pattern of light and shade corresponding to the electrode. For example, it is possible to make the area where necessary characters are injected thin without damaging the subject, and the area where the imprint information is extremely heavy to be darkened. A problem arises in which the periphery of the imprinted pattern becomes thinner, but this can be improved by lengthening the pole selection period or the light emitting time in the scan t of that portion.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the camera character imprinting device of the present invention. FIG. 2 is a timing diagram of the four-duty drive circuit of the circuit diagram shown in FIG. 1. FIG. 5 is a timing diagram of rung drive in the circuit diagram shown in FIG. 1. FIG. 4 is a timing diagram of a 1/M duty drive system according to another embodiment of the present invention. FIG. 5 is a timing diagram of an A duty driving method according to another embodiment of the present invention. 1...Counter 14-17...00M driver 18-20.
... Segment driver 44 ... Liquid crystal panel 31 ... Lamp. 33, input crotter, mouth "1st" L day "January" m 2nd figure king, 5t-1゜

Claims (1)

[Scope of Claims] A character imprinting device for a camera that has a light source and a liquid crystal panel and imprints characters or figures corresponding to the display on the liquid crystal panel onto a film, characterized by having the following configuration. Text imprinting device for cameras. a) A liquid crystal panel in which a display segment is composed of N scanning electrodes (N is a natural number of 3 or more) and a plurality of signal electrodes. b) A selection circuit that sequentially selects at least one scanning electrode at an arbitrary period. c) The display segment corresponding to the scan electrode selected by the selection circuit lights up the necessary pattern, and the display segment corresponding to the unselected scan electrode turns 1/2 so that it does not light up.
A liquid crystal drive circuit that performs M (M is a natural number smaller than N) duty drive.