JP3147674B2 - Optical glass filter holding structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the mounting structure of an optical glass filter (Y, M, C) for adjusting the amount of light.

[0002]

2. Description of the Related Art In a photographic printing apparatus, an optical glass filter A for adjusting the amount of light is held by holding means so as to be positioned in the optical path of printing light. Such a conventional structure for holding an optical glass filter includes an optical glass filter A placed on a holding plate B as shown in FIG. 3, and an optical system comprising a holding plate B and a holding plate C attached to the holding plate B. Both sides of the glass filter A are sandwiched. On the other hand, the optical glass filter A needs to be periodically removed and cleaned because dust or the like may reduce the amount of light or cause color unevenness when dust or the like adheres. However, with such a conventional holding structure, when cleaning the optical glass filter A, the optical glass filter A is removed from the holding plate C and the optical glass filter A is removed from the holding plate B in order to remove the optical glass filter A. Since it is necessary to directly touch the optical glass filter A, it is necessary to wear gloves so that fingerprints do not stick to the optical glass filter A, and there is a problem that the optical glass filter A is liable to be damaged. On the other hand, even when the optical glass filter A is mounted, since the optical glass filter A must be directly touched, there is a problem that the optical glass filter A is liable to be damaged as in the case of the removal. There is also a problem that the reproducibility of the glass filter A to the original mounting position tends to vary.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to remove and clean an optical glass filter without directly touching the optical glass filter. It is another object of the present invention to provide an optical glass filter holding structure capable of improving the reproducibility to the original mounting position.

[0004]

According to a first aspect of the present invention, there is provided an optical glass filter holding structure, comprising: an optical glass filter holding means for adjusting a light amount of a printing light source; and a lower holding plate and an upper mounting plate. Composed of a plate and
With attached to the plate mounting the optical glass filters, by attaching detachably superposed mounting plate to the holding plate, is held via a mounting plate to the holding plate optical glass filters Rutotomo
The mounting plate from above from the
The rate is attached to the holding plate .

According to a second aspect of the present invention, there is provided an optical glass filter holding structure according to the first aspect, wherein the mounting plate is mounted on the holding plate by superposing the mounting plate on the mounting plate and the holding plate. The positioning means for the optical glass filter is formed by providing a fitting portion on each surface.

[0006]

According to the optical glass filter holding structure of the first aspect, the optical glass filter is mounted on the mounting plate and the mounting plate is overlapped with the holding plate.
The optical glass filter to the holding plate via the mounting plate.
As well as from above from the surface of the holding plate
The mounting plate is attached to the holding plate
Runode, holding state of the optical glass filter is released by removing the mounting plate from the holding plate,
Removal and installation of the optical glass filter without touching the hand directly to the optical glass filter is possible.

According to the optical glass filter holding structure of the second aspect, when the optical glass filter is mounted on the holding plate, the fitting portions of the mounting plate and the holding plate are fitted to each other to position the mounting plate. And the reproducibility of the mounting position of the optical glass filter can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A holding means for holding an optical glass filter 1 is composed of a holding plate 2 located on a lower side and a mounting plate 3 located on an upper side, and the mounting plate 3 is positioned on the holding plate 2 as described later. It is configured to be positioned by means 7 and fixed to the holding plate 2 by fixing screws 5.

The mounting plate 3 is formed in a U-shape by a plate body 31 and both side pieces 35, and a round hole 32 is formed on both sides of the plate body 31 as a fitting portion.
And a long hole-shaped fitting hole 33, and a notch 34 for fixing is formed in the center of the plate body 31. Reference numeral 37 denotes a pressing plate formed by bending a spring plate. The pressing plate 37 is attached to both side portions 35 of the mounting plate 3 with fixing screws 6. That is,
A through hole 38 formed at the base end of the holding plate 37 for holding the fixing screw 6
And screwed into a screw hole 36 provided in the side piece 35 of the mounting plate 3. Further, the inner peripheral edges of the plate main body 31 and the both side pieces 35 of the mounting plate 3 are bent downward to form positioning pieces 39 and 39A.

When the optical glass filter 1 is mounted on the mounting plate 3, the optical glass filter 1 is positioned below the mounting plate 3, and the peripheral edge of the optical glass filter 1 is positioned on the positioning pieces 39, 3 of the mounting plate 3.
9A, and both side edges of the optical glass filter 1 are elastically held between the side piece 35 of the mounting plate 3 and the pressing plate 37.

The holding plate 2 is formed in a U-shape with a plate body 21 and both side pieces 24. On both sides of the plate body 21, cylindrical fitting projections 22 are formed as fitting parts. A screw hole 22 is formed in the center of the plate body 21, and the fixing screw 5 is screwed into the screw hole 22. A fixing hole 25 is formed in one side portion 24 of the holding plate 2.
The holding plate 2 is supported using a support frame (not shown).
It is fixed to.

When the mounting plate 3 is mounted on the holding plate 2, the mounting plate 3 is superimposed on the holding plate 2 and the fitting holes 3 of the mounting plate 3 are formed.
2 and 33 are fitted into the fitting projections 22 of the holding plate 2, and the screw portion of the fixing screw 5 is positioned in the notch 34 of the mounting plate 2. Then, the fixing screw 5 is tightened in this state, and the fixing screw 5 and the holding plate 2
Of the notch 34 is clamped. Thus, the mounting plate 3 can be mounted on the holding plate 2 in a state where it is accurately positioned.

When the optical glass filter 1 is to be removed, after the fixing screw 5 is loosened, the mounting plate 3 is picked up and the optical glass filter 1 is removed together with the mounting plate 3.

In this embodiment, the mounting plate 3 is provided with fitting holes 32 and 33 as fitting portions, and the holding plate 2 is provided with fitting projections 22 as fitting portions. The present invention is not limited thereto, and a fitting projection may be provided on the mounting plate 3 and a fitting hole may be provided on the holding plate 2.

[0015]

As apparent from the above description, according to the optical glass filter holding structure of the first aspect, if the mounting plate is detached from the holding plate, the optical glass filter is kept mounted on the mounting plate. The optical glass filter can be attached to the holding plate only by attaching the mounting plate to the holding plate, so the optical glass filter can be attached and removed without directly touching the optical glass filter. This makes it possible to prevent the optical glass filter from being damaged. According to the optical glass filter holding structure of the second aspect, the positioning of the mounting of the optical glass filter can be performed using the positioning means, so that the reproducibility of the mounting position of the optical glass filter can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a holding structure for an optical glass filter of the present invention.

FIG. 2 is an exploded perspective view showing an embodiment of the optical glass filter holding structure of the present invention.

FIG. 3 is an exploded perspective view showing a conventional example of a holding structure for an optical glass filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical glass filter 2 Holding plate 3 Mounting plate 7 Positioning means 22 Fitting protrusion (fitting part) 32 Fitting hole (fitting part) 33 Fitting hole (fitting part)

Claims (2)

(57) [Claims] 1. An optical glass filter holding means for adjusting the amount of light of a printing light source comprises a lower holding plate and an upper mounting plate, and the optical glass filter is mounted on the mounting plate. by attaching detachably the mounting plate superimposed on the holding plate, Rutotomo is held via a mounting plate to the holding plate optical glass filters
The mounting plate from above from the
A holding structure for an optical glass filter, wherein the plate is attached to a holding plate . 2. A positioning means for an optical glass filter, wherein a mounting plate is mounted on a holding plate in a superimposed manner, and a fitting portion is provided on each of the superposed surface of the mounting plate and the superposed surface of the holding plate. An optical glass filter holding structure according to claim 1.