JPS58144821A - Liquid crystal data imprinter - Google Patents

Abstract

PURPOSE:To minimize ghosts, flares, etc. by irradiating illuminating light from the direction where the contrast between the transparent part and opaque part of a liquid crystal is highest. CONSTITUTION:Light from an illuminating lamp 4 is made into parallel light by a lens. The parallel light reflects on the surface of a mirror 2, and passes through the hole 6a of a printed board 6, whereafter the light transmits through the transparent part of a liquid crystal 8 and imprints the projected image of the figures displayed on a film which is held roughly in tight contact with a pressing plate. The mirror 2 is mounted with >=45 deg. inclination with respect to the optical axis of a lens 3, so that the reflected light is made incident thereto with theta deg. inclination from the direction perpendicular to the plane of a liquid crystal display plate 8. The angle theta is limited at 5-10 deg. in such a way as to maximize the contrast between the transparent part and opaque part of the liquid crystal. Ghosts, flares, etc. are minimized with such constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data imprinting device for a camera.
In particular, we incorporate a liquid crystal display board and an illumination light source into the back of the camera.
The present invention relates to an improvement in a device for recording on film a projected image of data symbols or characters displayed on the display board.

In such a device, a voltage is applied to the part of the liquid crystal display board where the characters or symbols to be imprinted are made transparent, and the remaining part is opaque to display the data symbol. However, in this case, parts that should have been opaque were imprinted on the film, making it difficult to discern the data characters or the masu symbol that had been imprinted. There was a drawback. As mentioned above, the contrast between the transparent part and the opaque part differs depending on the direction of the incident light, and even in the part where the υh voltage that is incident on the liquid crystal from the perpendicular direction is not applied, 1! This is caused by high penetration.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the liquid crystal is configured so that illumination light is incident on the liquid crystal from a direction where the contrast between the transparent portion and the opaque portion is maximized.

Examples of the present invention will be described below.

FIG. 1 shows a cross section of the back cover of a camera equipped with a liquid crystal data imprinting device according to the present invention.

It is 8 on the back and 1 is on the back - 1, so 0 inside @ 1 la 1 2" receiving part 1 as
The holding portion 1BS of the lens 3 and the holding portion 1C of the illumination rung 4 are integrally provided. FIG. 2 is a plan view showing the holder of these optical systems. In the figure, the lamp holder shown in Fig. 5 is a cylindrical two-pump holder that holds a lamp 4, and has spring feet 5a and 5b, so that it can be fixed after adjusting the lamp position.

This is a printed wiring board that holds electronic clock circuits, liquid crystal drive circuits, etc., and is attached to the inner cover 7 facing inward.

8 is a liquid crystal display panel that displays the hours, minutes, seconds, company year, and 1st of the month, and is held in the hole 7a of the inner hole a7 in front of the mirror 2, as shown in an enlarged view in FIG. is connected to the wiring pattern on the printed board 6 via the conductive rubber 9, of which 1f7
It is fixed by a liquid crystal holding plate 10 screwed to. 11tj A well-known film pressure plate is held by an unillustrated leaf spring on the inner side If7, and is provided with holes 11 for guiding light transmitted through the liquid crystal to the film.

The electronic clock circuit and LCD drive circuit are operated by a battery (not shown), and the LCD display always displays the hours, minutes, seconds, year, month, and day numbers as transparent characters, and the release signal of the Langhan camera. It lights up for a certain period of time by entering the back cover side.

The light from the illumination lamp 4 is turned into parallel light by the Kohan lens, reflected on the surface of the mirror 2, passes through the hole 6- of the printed board 6, passes through the transparent part of the liquid crystal 8, and is twisted onto the pressure plate! Imprint the projection of the numbers displayed on a piece of film in close contact with each other.

The mirror 2 is attached at an angle of 45° or more with respect to the optical axis of the lens 60, and the reflection ft, as shown in FIGS. 1 and 6, is incident on the surface of the liquid crystal display panel at an angle r from the direction perpendicular to the surface.

This angle is set to 5 to 10 so as to maximize the contrast between the transparent and opaque parts of the liquid crystal described above. In this embodiment, the optical path of the illumination light from the lamp 4 is deflected by a mirror. The present invention is not limited to this, and if a mirror is not used, the light source may be placed at a position off the original axis of the lens 3.

In addition, when using a rug as a light source as in this example, 2
The particles emitted from the filament of the lamp are reflected on the inner surface of the glass, resulting in the appearance of multiple light sources, and the image of a single numeric symbol may be duplicated; however, in the present embodiment, the head of the lamp Since the lens 3 is arranged so that it faces the lens 3, the reflected light on the inner surface of the 2-lens lamp is prevented from entering the optical path, so ghosts, flares, etc. can be kept to a minimum.

As mentioned above, in a data imprinting device that uses a transmitted-light type liquid crystal, the illumination light is irradiated from the direction where the contrast between the transparent and opaque areas of the liquid crystal is highest, so that the film is It is possible to imprint clear data images.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the back cover having the device of the present invention, FIG. 2 is a plan view showing the optical system holding portion of the back cover, and FIG. 6 is an enlarged sectional view of the liquid crystal mounting portion. 1! Back cover, 2: Mirror, 5! Lens, 4: Illumination light source, 6
: Printed board, 7! Inner lid, 8 rich liquid crystal display board, 1111 pressure plate. Tafu Canon Co., Ltd. Agent Gi Marushima -'=: 7g-2+! ψ

Claims (2)

[Claims] (1) A liquid crystal display board that displays data symbols is placed close to and parallel to the film surface, and is tilted at a certain angle with respect to the liquid crystal display board so that the contrast between the transparent and opaque parts of the liquid crystal is maximized. A liquid crystal data imprinting device characterized in that a parallel light is irradiated from a different direction and an oblique image thereof is imprinted on a film. (2) The liquid crystal display described in Patent No. 8 Seigyu no Han - Disciple (1), characterized in that it has a lamp for illuminating the liquid crystal display board, and the head of the lamp is arranged so as to face the liquid crystal display board. Data imprinting device.