JPH0228513Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a data imprinting device for a camera that imprints data on the back side of a film using a data display element.

As this type of imprinting apparatus, one in which an imaging optical system is disposed between a data display element (for example, a solid-state light emitting element consisting of a seven-segment LED) and the back surface of the film is conventionally known. An example of this will be explained based on FIG.

A photosensitive film 1 is placed on the front side of a film pressure plate 2, which has an opening 2a for imprinting data from behind. are installed at regular intervals.

A solid state light emitting device consisting of a solid state light emitting section 10, a substrate 11 and a cover 12 is attached to the support plate 3. Substrate 11 to which solid-state light emitting section 10 is attached
The cover 12 fixed to the support plate 3 has a shape that surrounds the solid-state light emitting part 10, and is fitted into the hollow part of the lens holder 6 fixed to the support plate 3 while passing through the opening 3a of the support plate 3. .

A pair of imaging lenses 7 and 8 are inserted into the opening side of the lens holder 6 (near the left end in FIG. 1) with an aperture 9 in between, and the data displayed by light emitted from the solid-state light emitting section 10 is transmitted to the lenses. Therefore, the image is formed on the film 1.

However, this conventional device had major drawbacks.
This is related to an error in setting the distance of the solid-state light emitting unit 10 from the back surface of the film 1, and an error in the back focus of the imaging lenses 7 and 8.

) is a combination of manufacturing errors such as the thickness of the film pressure plate 2 and the support plate 3 and the length of the support column 4. Also, the error of lens 7,
It is determined by adding the above error to the manufacturing error of 8 and diaphragm 9. Therefore, the error in the distance (back focus) between the lens 7 and the film 1 becomes very large, and the data imprinted on the film becomes blurred.

The reason why such errors are disliked is that when trying to imprint data in a short time using a bright imaging lens, the depth of field of a bright imaging lens becomes shallow. It can be mentioned that the error is more closely related to the blurring of the data.

In order to avoid such problems, it is necessary to accurately adjust the position of the solid-state light emitting unit 10 and the positions of the imaging lenses 7 and 8, but these are necessary to accurately adjust the positions of the solid-state light emitting unit 10 and the imaging lenses 7 and 8. Since it is installed in a small space between the two, many difficulties arise in adjusting its position.

The present invention has been made for the purpose of solving the problems in the above-mentioned camera imprinting device. In order to achieve this objective, the present invention uses a substrate on which a plurality of data display elements are arranged in a data imprinting device for a camera that imprints data formed by data display elements onto the back side of the film. A support plate 3 for supporting the film, and a film pressure plate 2 having an opening that allows data display light from a plurality of data display elements to pass through to the back side of the film.
, a spacer 4 for keeping the supporting plate and the film pressure plate at a constant distance, and a spacer 4 arranged to correspond to the plurality of data display elements in order to form an image of data display light from the plurality of data display elements on the back surface of the film. and a plurality of integrally molded imaging lens parts 7,
8, and an abutting part that integrally projects from the periphery of the entire plurality of imaging lens parts in the optical axis direction and comes into contact with the back surface of the film pressure plate, and between the support plate and the film pressure plate. A lens holder 6 is provided in which the image forming means is slidably fitted and whose length in the optical axis direction is shorter than the spacer, and a lens holder 6 which is fitted into the lens holder and which connects the abutting part of the coupling means from the support plate side to the film pressure plate. This includes a biasing member 20 that presses against the back surface.

Hereinafter, an explanation will be given based on FIGS. 2 and 3 showing examples. In this case, members that perform the same functions as those in the embodiment shown in FIG. 1 are designated with the same numbers, and
What was not clear in Figure 1 (specific shapes,
The explanation will focus on the number of pieces, etc.).

The film pressure plate 2 has a horizontally long opening 2a, and the supporting plate 3 is connected to the opening 2a by three cylindrical spacers 4 and screws 5 (only two are shown in FIG. 3).
is fixed.

The solid-state light-emitting section 10 of the solid-state light-emitting element has three sets of seven-segment LEDs each having a combination of two as a data unit display digit. Rectangular substrate 11 and cover 12 equipped with solid-state light emitting section 10
is integrally fixed. The lens holder 6 and the substrate 11 are fixed to both sides of the support plate 3 by two screws 13 with a portion of the cover 12 passing through the opening 3a. The tip of the cover 12 is fitted to one end of a rectangular cylindrical lens holder 6 fixed to the support plate 3, and a pair of imaging lenses 7, 8 (same focusing) fitted to the other end of the lens holder. A leaf spring 20 is interposed between the aperture 9 and the cover 12 (which have image characteristics and are arranged facing each other), the diaphragm 9 and the cover 12 .

The imaging lenses 7, 8 and the diaphragm 9 have a rectangular shape as a whole, and are each made up of three independent parts corresponding to the solid-state light emitting section 10, and the lateral magnification β of this optical system is preferably 0. <β<1.
In other words, it is a reduction optical system (however, the vertical magnification α=β ² ). The leaf spring 20 is made up of a frame part with an aperture in the center for passing data display light and four legs, and absorbs the play between the optical system and the cover 12 to move the optical system to the film pressure plate 2. It is pressed against the back of the The positions and imaging characteristics of the imaging lenses 7 and 8 are such that the data display light is focused on the film 1 in this state.

In this embodiment, since the imaging optical system consisting of the imaging lenses 7 and 8 and the aperture 9 is positioned with the film pressure plate 2 as a reference, the solid-state light emitting unit 10 is Variations in the position of do not affect the imaging effect in any way. Moreover, since the reduction optical system is assumed to be a reduction system here, for example, the solid-state light emitting part (object point) 1
Even if the distance from the imaging lens 0 changes by x, the image point (imaging position of the solid-state light emitting unit 10) will only change by xβ ² , and the predetermined data will be clearly imprinted on the film 1. Become. This also means that positioning of the solid-state light emitting section 10 does not require much precision, that is, it is acceptable even if some manufacturing errors occur in the spacer 4 and the support plate 3.

Although a certain amount of manufacturing error occurs in the optical system itself, this is small compared to the manufacturing error of the spacer 4, etc., and does not pose a major problem.

Furthermore, the present invention should not be construed as being limited to the above embodiments, and a plurality of known coil springs may be used as the biasing member. The arrangement of the biasing member and the data display element are not limited to solid-state light emitting elements, and can be modified as appropriate.

As is clear from the above explanation, according to the present invention, an imaging means formed by integrally molding a plurality of imaging lens parts and a contact part protruding in the optical axis direction is arranged according to the positioning of the lens holder. Since the biasing means is brought into direct contact with the back surface of the film pressure plate, the distance between the imaging means and the film and the centering of the optical axis can be determined with high precision. Further, since the distance between the imaging means and the film surface is determined to be a predetermined distance, there is no possibility that the image will be out of focus even if a bright imaging lens with a shallow depth of field is used.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional example. FIG. 2 is a front sectional view showing an embodiment of the present invention, and FIG. 3 is an exploded perspective view thereof. Explanation of symbols of main parts, 1... Photosensitive film,
2...Film pressure plate, 3...Support plate, 4...Spacer, 6...Lens holder, 7, 8...Imaging lens, 9...Aperture, 10...Solid light emitting section, 12...
...Cover, 20...Plate spring (biasing member).

Claims (1)

[Claims for Utility Model Registration] In a data imprinting device for a camera that imprints data formed by data display elements onto the back side of a film, a support plate that supports a substrate on which a plurality of said data display elements are arranged. a film pressure plate having an opening that allows data display light from the plurality of data display elements to pass through to the back side of the film; a spacer that maintains a constant distance between the support plate and the film pressure plate; In order to form an image of data display light from a data display element on the back surface of the film, a plurality of imaging lens parts are arranged corresponding to the plurality of data display elements and integrally formed; and an abutting part that integrally projects from the periphery of the entire imaging lens part in the optical axis direction and abuts against the back surface of the film pressure plate; and between the support plate and the film pressure plate. a lens holder, which is fitted into the lens holder and into which the image forming means is slidably fitted and whose length in the optical axis direction is shorter than the spacer; A data imprinting device for a camera, comprising: a biasing member that presses against the back surface of the film pressure plate.