JPH0731241Y2 - Reflective lighting support device for vertical plate-making camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a supporting device for a reflection illumination light source in a vertical plate-making camera.

<Prior art> Generally, in a vertical plate-making camera, if the shooting magnification is low (1/2
In the case of a high magnification (2 times or more), the exposure is increased in the peripheral area of the original in consideration of the decrease in the illuminance around the image surface due to the cos ⁴ θ law of the tying lens. Since the time is significantly lengthened, illumination is performed with a focus on shortening the exposure time rather than the illuminance distribution. That is, at low magnification, the position of the reflection illumination light source (the height relative to the document surface) is lowered to irradiate the peripheral area of the document relatively strongly, and at high magnification, the position of the reflection illumination light source is increased to increase the original. The irradiation angle of the reflected illumination is switched so that the central part of the irradiation is relatively strongly irradiated.

As a reflection illumination supporting device of this type, a device shown in FIG. 4 is conventionally known.

It consists of a pair of arm support brackets 14 fixed to the manuscript table 11 of a vertical plate making camera, and each arm support bracket 14
The tilt fulcrum shaft 15 is installed on the
The base end portion 17a of 17 is tiltably supported, and the irradiation angle of the light source arm 17 is switched and set by the irradiation angle setting tool 30 according to the photographing magnification of the vertical plate-making camera.

Then, the irradiation angle setting tool 30, the arm support bracket 14 is rotatably provided with a rectangular eccentric support shaft 30a separated from the tilt fulcrum shaft 15, by receiving the light source arm 17 by the eccentric support shaft 30a, The irradiation angle can be switched appropriately.

Note that FIG. 4 (A) shows a mode of supporting the reflective illumination at low magnification, and FIG. 4 (B) shows a mode of supporting the reflective illumination at high magnification.

<Problems to be solved by the invention> In the above-mentioned conventional example, when switching the irradiation angle, the light source arm 17 must be lifted by one hand and the eccentric support shaft 30a must be rotated by the other hand, and both hands are used. Therefore, there is a drawback that the operation is troublesome.

Further, in the state of FIG. 4B, when the operator's body or the like touches the light source arm 17 and the light source arm 17 floats up, the eccentric support shaft 30a rotates eccentrically by itself, and the same figure (B) May change to the state of.

The present invention has been made in consideration of such circumstances. Make it easy to switch the irradiation angle with one hand, b. A technical problem is to prevent the setting state of the irradiation angle from changing even when the light source arm is lifted.

<< Means for Solving the Problems >> The present invention is configured as follows to solve the above problems.

That is, a pair of arm supporting brackets are fixed to the platen of a vertical plate making camera, each arm supporting bracket is provided with a tilting fulcrum shaft, and the light source arm is tiltably supported by the tilting fulcrum shaft. In the reflection lighting support device of the vertical plate-making camera configured so that the irradiation angle of the light source can be set, the fulcrum shaft insertion hole at the base end of the light source arm is formed as a long hole and separated from the tilt fulcrum shaft in each arm support bracket. In addition to providing the angle setting support shaft, a plurality of engaging grooves that engage with the angle setting support shaft are recessed in the base end portion of the light source arm to form an irradiation angle setting tool, and the tilting fulcrum shaft is provided in the long hole. It is characterized in that the light source arm is provided so as to be capable of advancing and retreating / tilting through the insertion, and the angle setting support shaft is configured to be selectively engaged with a plurality of engagement grooves having different depths.

<Operation> In the present invention, the irradiation angle setting tool comprises an angle setting support shaft provided on the arm supporting bracket and a plurality of engagement grooves recessed at the base end of the light source arm and having different depths. When switching the irradiation angle, while raising the light source arm while moving the tilting fulcrum shaft through the fulcrum shaft insertion hole formed in the elongated hole, one of the engaging grooves becomes the angle setting supporting shaft. Can be engaged.

That is, the depth of the engagement groove is set to an appropriate dimension that defines the irradiation angle of the light source arm, and by engaging the desired engagement groove with the angle setting support shaft, the irradiation angle can be adjusted to an appropriate value. It can be switched. Therefore, the irradiation angle can be switched with one hand, and the irradiation angle does not change simply by lifting the light source arm.

<< Embodiment >> FIG. 1 is an exploded perspective view showing an embodiment of a reflection illumination support device, FIG. 2 is an operation explanatory view thereof, and FIG. 3 is a perspective view of a vertical plate-making camera including the reflection illumination support device. is there. First,
The vertical plate-making camera will be briefly described.

As shown in FIG. 3, in this vertical plate-making camera, a photographing rack is provided in a photographing frame opening frame 2 of a substantially U-shaped base frame 1, and a lens rack 9 and a document rack 10 are respectively movable up and down. It is configured.

The photographing rack 3 has a focus glass 4 rotatably attached to the right side and a film suction plate 5 closer to the left side of the opening frame 2 of the photographing unit, and selectively rotates the focus glass 4 and the film suction plate 5. It is configured to move and be positioned on the image plane. Reference numeral 6 is an operation panel, and 7a and 7b are a light emitting window and a photometric probe that constitute the densitometer 7.

The lens rack 9 is connected to the photographing rack 2 via the bellows 8. Further, a plurality of imaging lenses (not shown) are attached to the center of the lower surface of the lens rack 9 so that the lenses can be exchanged, and the required photographing magnification is obtained. It is designed to cover a range.

The document rack 10 is provided with a document table 11 which is vertically movable, a document pressure bonding glass plate 12, a pair of reflection illumination light sources 20 and 20 supported by the document table 11 via a reflection illumination supporting device 13, and a document table 11. And a transillumination light source (not shown) mounted on the lower surface of the auto-focusing mechanism (so as to illuminate the document placed on the document table 11 and photograph it at a desired magnification. It is configured to be positioned together with the lens rack 9 via (not shown).

Hereinafter, the reflective illumination supporting device according to the present invention will be described.

As shown in FIG. 1, the reflection / illumination supporting device 13 includes a document table 11
A pair of arm support brackets 14 and 14 are fixed to each arm support, and each arm support bracket 14 has a tilt fulcrum shaft 15 and an angle setting support shaft.
16 and 16 are placed in parallel with each other, and the base end of the light source arm 17
The fulcrum shaft insertion hole 18 of 17a is formed in a long hole, and the tilting fulcrum shaft 15 is inserted into the long hole so that the light source arm 17 can be moved back and forth and tilted. A plurality of different engagement grooves 19a and 19b are provided upwardly, and the angle setting support shaft 16 and the engagement grooves 19a and 19b constitute an irradiation angle setting tool 20.

As shown in FIG. 2 (A), the depth of one of the engaging grooves is one when the photographing magnification is low (less than 2) when engaged with the angle setting support shaft 16. On light source arm 17
Is regulated so that the irradiation angle is appropriate, and
The depth of the other engaging groove 19b is as shown in FIG. 2 (B).
It is specified that the light source arm 17 has an appropriate irradiation angle when the photographing magnification is high (2 times or more).

Therefore, one of the engagement grooves 19a
By engaging the 9b and the angle setting support shaft 16, the irradiation angle can be appropriately switched. In that case, the light source arm
Lift 17 and move it back and forth.

In addition, in the said Example, although what has two types of engaging grooves with different depth was illustrated, it is not restricted to this, Moreover, the form of a bracket can also be changed suitably and can also be implemented. .

<< Effect of Device >> As is apparent from the above description, according to the present invention, since it is configured and operates as described above, the following effects are obtained.

I. With the tilting fulcrum shaft inserted in the fulcrum shaft insertion hole formed in the long hole, one of the engaging grooves can be engaged with the angle setting supporting shaft by advancing and retracting the light source arm. The irradiation angle can be switched with, which is convenient.

B. Also, simply raising the light source arm does not change the irradiation angle unlike the conventional example.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a reflection illumination supporting device, FIG. 2 is an operation explanatory view thereof, FIG. 3 is a perspective view of a vertical plate making camera having the reflection illumination supporting device, and FIG. It is a figure corresponding to Drawing 2 of a prior art example. 11 …… Platen, 14 …… Arm support bracket, 15 ……
Tilt fulcrum axis, 16 …… Angle setting spindle, 17 …… Light source arm,
17a: base end of light source arm, 18: fulcrum shaft insertion hole, 19a
・ 19b: Engagement groove, 20: Irradiation angle setting tool.

Claims (1)

[Scope of utility model registration request] 1. A pair of arm supporting brackets are fixed to a document table of a vertical plate-making camera, and each arm supporting bracket is provided with a tilt fulcrum shaft, and the light source arm is tiltably supported by the tilt fulcrum shaft, and an irradiation angle. In the reflection lighting support device of the vertical plate-making camera that is configured to set the irradiation angle of the light source with the setting tool, the fulcrum shaft insertion hole at the base end of the light source arm is formed as a long hole, and the tilt support point is provided on each arm support bracket. An angle setting support shaft is provided separately from the shaft, and a plurality of engaging grooves that engage with the angle setting support shaft are recessed in the base end of the light source arm to form an irradiation angle setting tool, which tilts into a long hole. A vertical plate-making plate, characterized in that the fulcrum shaft is inserted to allow the light source arm to move back and forth and tilt, and the angle setting fulcrum is configured to be selectively engaged with a plurality of engaging grooves having different depths. Reflective lighting support device for camera