JPH0467024A - Data imprinting device for camera - Google Patents

Abstract

PURPOSE:To reduce the size and thickness of the device by providing a condenser lens between a light source and a liquid crystal panel on an optical path extending to a film, and not providing a light shield mask on the liquid crystal panel. CONSTITUTION:The condenser lens 6 is provided between the light source 4 and liquid crystal panel 7 on the optical path extending to the film and the liquid crystal panel is not provided with light shield mask. The center line of the light emitted by an LED lamp 4 passes through an optical guide part formed of a front panel frame 1, a circuit board 5, and a panel frame 5 and is reflected by a reflecting mirror 2 fixed to the front panel frame 11, passes through the condenser lens 6, and transmits through the liquid crystal panel 7. The light emission spectrum of the LED is monochromatic, so a non- illumination part is never imprinted even in the absence of a light shield mask which has its peak light emission wavelength below about 700 nm where the spectral transmissivity 23 of the non-illumination part of the liquid crystal panel rises. Consequently, the data imprinting device can be fitted to the camera main body side and the overall thickness of the camera is reducible.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to a data imprinting device for a camera.

[Prior Art 1] Conventionally, data imprinting devices for cameras irradiate light transmitted through a liquid crystal panel from the film base side to imprint dates, comments, and various other data onto the film.

A tungsten lamp is used as the light source for imprinting, and the emission spectrum of the tungsten lamp has the characteristic that the emission intensity increases as the wavelength becomes longer. Looking at the spectral transmittance of a liquid crystal panel, it is desirable that the transmittance is ○ in all wavelength ranges in areas where light does not pass through, but at present it is unavoidable that 700 nm FM
A small amount of light is transmitted in the longer wavelength range than near, and when printed out after being imprinted on a film, parts that should not be photographed become slightly colored, reducing quality, so other than the display segments of the liquid crystal panel. This area is covered with a light-blocking mask to prevent quality deterioration.

[Problem to be Solved by the Invention 1] In the conventional technology described above, in order to imprint from the film base side, the imprinting device is incorporated into the back cover, but this makes the back cover thicker. Naturally, the entire camera has become thicker. In recent years, emphasis has been placed on portability, especially in compact cameras using lens shanks, and demands for smaller and thinner cameras are increasing, and increasing the size of cameras due to imprinting devices is an issue that must be avoided. The object of the present invention is to solve this problem and provide a compact camera that is small and thin.

[Means for solving the problem] A camera that has a liquid crystal panel and a light source, the light from the light source passes through the liquid crystal panel, and data corresponding to the data displayed on the liquid crystal panel is imprinted from the photosensitive emulsion side of the film. A data imprinting device for use in a computer has a condenser lens between the light source and the liquid crystal panel on the optical path that is emitted from the light source, passes through the liquid crystal panel, and reaches the film, and the liquid crystal panel has a light shielding device that blocks light from areas other than the display segment. Consists of no mask.

[Example] The present invention will be explained in detail below.6 As a solution to the problem with the prior art, that is, the camera becomes thick, it is possible to move the device to the front so that the image is captured from the film emulsion side (front side). Just go. When imprinting from the front side of the film, if you bring the LCD panel close to the film, the screen will naturally be vignetted.
It is necessary to place an optical lens system for imaging on the imaging optical path at a location away from the imaging optical path.

FIG. 1 is a sectional view of an optical path portion of an embodiment according to the present invention. The light was emitted from the LED lamp 4 mounted on the circuit board 3.

The center line of the light passes through the light guide section formed by the front panel frame 1, the circuit board 3, and the back panel frame 5, is reflected by the reflecting mirror 2 fixed to the front panel frame 1, and passes through the condenser lens 6. , transmitted through the liquid crystal panel 7. At this time, the light beam emitted from the LED lamp 4 while being diffused is converged by the condenser lens 6.

FIG. 3 is a partial sectional view of a liquid crystal panel according to the prior art. 8 is a polarizing plate on the incident light side, 9 is an upper light shielding mask, 10 is a lower glass substrate, 11 is a liquid crystal, 12 is an upper glass, 13 is an upper light shielding mask, 14 is a polarizing plate on the output light side, 15 is a lower electrode, 1
6 is an upper electrode, and 17 is a film. The desired imprint shape is part A formed by the upper light-shielding mask. If the conventional technology does not include the condenser lens 6, the light emitted from the liquid crystal panel will be 19, but by inserting the condenser lens, it will be narrowed down to 18. At this time, the light incident on the liquid crystal panel is completely shaped by the upper light-shielding mask 9, and the emitted light becomes narrower than the desired shape. FIG. 2 is a partial cross-sectional view of a liquid crystal panel without a light shielding mask according to the present invention. The desired data is the part B where the lower electrode 20 and the upper electrode 21 overlap, but this is not affected by incident light and does not become thinner even if a condenser lens is included, as in the present invention. If the light-shielding mask is eliminated, the imprinted portion of the non-lighted area will become noticeable as explained in the conventional technique, making it very impractical. Therefore, the present invention provides L as a light source.
I am using ED4. That is, the emission spectrum of the LED is 22 in Fig. 4, and because it is monochromatic, it has a peak emission wavelength below around 700 nm, where the spectral transmittance of the liquid crystal panel increases at 23 when the liquid crystal panel does not turn on. , even without a light-shielding mask, the non-lit parts will not be imprinted.

As explained above, by using an LED as a light source and using a liquid crystal panel that does not use a light shielding mask, a data imprinting device for a camera that can imprint from the immediate vicinity of the film has been realized.

[Effects of the Invention] In the embodiment according to the present invention, the data imprinting device can be attached to the camera body side, thereby making it possible to reduce the thickness of the entire camera. In addition, the photosensitivity of the film is naturally higher on the emulsion side than on the base side, which makes it possible to shorten the light emission time of the light source lamp, which means that current consumption can be reduced. The electronic level of the camera is amazing, and all controls are electronic.For this reason, while the current consumption of the camera as a whole tends to increase, the advantage of reducing current consumption is immeasurable.In addition, light shielding By eliminating the mask, the mask creation step in the liquid crystal panel manufacturing process can be omitted, and the device can be provided at a low cost, which is a significant effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the optical path of the camera data imprinting device according to the present invention. The second section is a partial sectional view of a liquid crystal panel used in the camera data imprinting device according to the present invention. FIG. 3 is a partial sectional view of a liquid crystal panel used in a conventional camera data imprinting device. FIG. 4 is a diagram showing an emission spectrum of an LED and a non-lighting partial light transmittance diagram of a liquid crystal panel used in the data imprinting device for a camera according to the present invention. l...Front panel frame 19 ・ ・ 20 ・ ・ Reflector, circuit board, LED lamp back panel frame Condenser lens Liquid crystal panel Incident light side Polarizing plate Royal light mask Lower glass substrate LCD upper glass substrate Upper light shielding mask Outgoing light side Incident light when passing through a polarizing plate lower electrode upper electrode film condenser lens Conventional incident light Lower electrode upper electrode Emission spectrum of LED 23 Spectral transmittance of non-lighted part of liquid crystal panel Applicant Seiko Epson Corporation Company agent Patent attorney Kisanbe Suzuki (and 1 other person) No. 10 Figure 2

Claims (1)

[Claims] In a data imprinting device for a camera, comprising a liquid crystal panel and a light source, light from the light source passes through the liquid crystal panel, and data corresponding to display data on the liquid crystal panel is imprinted from the photosensitive emulsion side of the film. , a condenser lens is provided between the light source and the liquid crystal panel on an optical path that is emitted from the light source, passes through the liquid crystal panel, and reaches the film, and the liquid crystal panel has a so-called condenser lens that blocks light from areas other than the display segment portion A data imprinting device for a camera, characterized in that it does not include a light-shielding mask.