JPS62266529A - Illuminating device for projection - Google Patents

Abstract

PURPOSE:To remove the generation of uneven illumination and to improve the quality of a video by providing the titled device with a positioning means for positioning an illuminating device in the projecting optical axis direction of a field lens, a guiding means for fixing the position in the direction rectangular to said optical axis direction and a locking means for holding an positioned illuminating unit its position. CONSTITUTION:A hole 31 for positioning the illuminating unit in the direction rectangular to the optical axis direction of the field lens at the assembling of the illuminating unit with a base 30 for an illuminating device body in the optical axis direction is formed on the base 30. On the other hand, a boss 10 to be engaged with the hole 31 is formed on the illuminating unit and the hole 31 and the boss 10 constitute the guiding means for regulating the illuminating unit in the direction rectangular to the optical axis and fixing the unit on a regular position. A regulating member 11 to be abutted to the base at the time of assembling to fix the position of the unit in the optical axis direction is arranged on the side of the boss 10 of the unit. Since the illuminating unit is pressed to the base 30 of the body by the member 11 on the basis of the elastic pressure of a spring 12, the unit can be positioned on the optical axis direction without generating any play.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an illumination device for enlarging and projecting a film image.

(Prior Art and Problems) The illumination system of readers and reader printers that enlarge and project images on film, such as microfilm, generally includes a halogen lamp as a light source, a condenser lens, a heat insulating glass, an infrared transmitting reflective mirror, It consists of a field lens (the condenser lens closest to the film).

If these optical components are not placed accurately in predetermined positions, when an image is projected onto the screen, uneven illumination will occur in each part, resulting in an image that is very difficult to see.

For this reason, conventionally, these optical components have been combined into one illumination unit that is integrally arranged. The lighting unit has a structure that allows it to be easily attached to and removed from the lighting device body in pairs for lamp replacement or lens cleaning. It needs to be held accurately.

Conventionally, this type of lighting unit has been made in a manner that it can be pulled out toward the side of the lighting device main body, as shown in FIG. In this case, when the lighting unit is attached to the lighting device main body, the optical axis of the projection lens 101 provided in the lighting device and the optical axis reflected by the reflection mirror 102 of the lighting unit are set at right angles. In this direction, the lighting unit is placed against the protrusions 1) 0 and 1) 1 that protrude from the bottom and top surfaces of the lighting device body, and the device is positioned in the same direction (direction perpendicular to the page) using similar protrusions (not shown). Was. Further, in the X direction, positioning was performed using a sliding surface on the lower surface of the lighting device main body.

However, in the conventional device described above, there are a large number of positioning protrusions and they are far apart from each other, making it difficult to achieve precision during manufacturing. However, there is a problem in that the optical axis of the projection lens 101 and the optical axis directed upward at a right angle to the reflecting mirror 102 are shifted from each other, resulting in an image on the screen that is difficult to see due to uneven illumination.

(Means for Solving the Problems) The present invention solves the problems of the above-mentioned conventional devices, eliminates the misalignment of the optical axis between the lighting unit and the lighting device main body, and provides illumination with uniform illuminance. Its purpose is to provide equipment.

In order to achieve the above object, the present invention provides a projection illumination device configured as a series of optical system units from a light source to a field lens, and in which the illumination unit is removably incorporated into the illumination device main body. a guide means for guiding the illumination unit in the optical axis direction while regulating the illumination unit to a normal position in a direction perpendicular to the optical axis when the illumination unit is attached to the illumination device main body from the direction of the projected optical axis of the field lens, and the guided illumination unit positioning means for positioning the lighting unit at the correct position in the optical axis direction; and locking means for locking the lighting unit placed at the normal position by the guide means and positioning means on the lighting device main body. .

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings 1 to 3.

The projection illumination device of this embodiment consists of a lighting device main body and a lighting unit assembled into the main body.

1 and 2 show a cross-sectional view and a side view, respectively, of the lighting device of this embodiment, and FIG. 3 is a perspective view of the lighting unit.

The lighting unit includes a halogen lamp 1 as a light source, a reflector 2 placed behind it, a condenser lens 3 placed sequentially in front, a heat insulating glass 4, a reflection mirror 5, and a field lens 6 mounted on a lighting board 20 with high precision. They are positioned and assembled to form an integrated lighting unit. Here, the light emitted from the halogen lamp 1 either directly or after being reflected by a reflection plate 2 becomes substantially parallel light through a condenser lens 3, and heat rays are absorbed by an insulating glass 4. The light that has passed through the heat insulating glass 4 is directed upward by a reflective mirror 5 and condensed by a field lens 6 to illuminate the image on the microfilm F. The image on the microfilm F is projected by the projection lens 7 directly or via several mirrors onto a screen (not shown).

A hole 31 is bored in the substrate 30 of the illumination device main body for determining the position in the direction perpendicular to the optical axis when the illumination unit is assembled into the substrate 30 in the optical axis direction of the field lens, On the other hand, the lighting unit is provided with a boss 10 that engages with the hole 31.
Accordingly, the side foot of the boss 10 of the lighting unit, which constitutes a guide means for regulating the lighting unit in the direction perpendicular to the optical axis and fixing it in the normal position, is in contact with the substrate 30 during the installation. Regulating member 1 that determines the position in the optical axis direction
) is provided. The lighting unit is pressed against the substrate 30 of the lighting device main body by the elastic force of the spring 12, which will be described later, at the regulating member 1), so that it is positioned in the optical axis direction without any play. It has become. Thus, the regulating member and the spring serving as the elastic member constitute a positioning means.

There are hooks 1 with long lights on both the left and right ends of the illumination base Fi20.
4 is installed. This hook 14 is regulated by the long light and the screw 16 on the board 20 and can slide up and down with respect to the board 20 between both screws 16 and 16, and is always moved downward by a spring. being pulled. Further, a release lever 15 is attached to the hook 14 and rotates around a screw 15a. On the other hand, a hanging fixture 13 having spring properties is attached to the substrate 30 of the lighting device main body. The hook 13 is adapted to be hooked onto the hook 14 of the lighting unit to hold the lighting unit in a predetermined position by hand when the lighting unit is assembled. In other words, the above-mentioned hanging tool 13 has a spring property, so that when it is assembled, the hook 1
4, it is deformed by being pressed, and is restored to its original shape at the completion position of the lighting unit and is hooked to the hook 14. The hook 14 is also provided with a release lever 15 that rotates around a screw 15a and presses the hook 13 in the latched state, thereby transforming it into an unlatched state.

Thus the hanger 13. The hook 14 and the release lever 15 constitute a locking means.

Next, the procedure for assembling and removing the lighting unit into the lighting device main body will be explained.

First, when attaching the lighting unit to the lighting device main body, lift the lighting unit along a guide (not shown) and align the positioning boss 10 with the base vi30 of the lighting device main body.
to fit. The illumination unit is thus positioned perpendicular to the optical axis of the field lens. Further, the regulating member 1) is lifted up until it hits the substrate 30 of the lighting device main body. While pressing the lighting unit upward, push the hook 14 on the side of the lighting unit upward with its bottom 14a. Then, the hanging tool 13 having spring properties is deformed along the slope 14a of the hook 14. When the hook 14a is further pushed, the hanging tool 13 is attached to the stepped portion 14c of the hook 14.
It gets stuck in due to the restoring force of the spring. In this state, the hook 14 is caught on the hanger 13, and the lighting unit is attached to the spring 12.
The regulating member 1) is pulled upward and pressed against the substrate 30 of the illumination device main body, and the field lens is positioned in the optical axis direction.

Next, when removing the lighting unit from the lighting device main body, push the release lever 15 in the direction of the arrow in FIG. , the hook 13 is deformed and the step 1 of the hook is
4c, the lighting unit falls under its own weight.

The removal is thus done.

In this embodiment, the positioning boss 10 and the regulating member 1) are formed as one piece, but they may be formed separately, and the regulating member 1) may be formed by forming the side plate of the substrate 20 of the lighting unit. It may also be formed by stretching.

(Effects of the Invention) The present invention includes a lighting unit that is attached to the lighting device main body in the direction of the projected optical axis of the field lens, a positioning means in this direction, and a guide means for positioning in a direction perpendicular to the direction. is the positioned lighting unit I.
Since the device is provided with a locking means for holding the device in that position, there is no possibility that the installation may sometimes shift in a direction perpendicular to the optical axis, resulting in uneven illuminance, and the quality of images is improved. Furthermore, the front field lens does not pose any hindrance when attaching or detaching the lighting unit, and the operation of the sheep is simple and lamp replacement or lens cleaning becomes extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a projection illumination device according to an embodiment of the present invention;
2 is a side view of the device shown in FIG. 1; FIG. 3 is a perspective view showing the illumination unit of the device shown in FIG. 1; and FIG. 4 is a sectional view of the conventional device. 6・・・・・・・・・・・・・・・・・・Field lens 10.31・・・・・・・・・Guiding means (1
0...boss, 31...hole) 1). 12...
...Device determining means (1) ...Regulation member, 12
...elastic member spring) 13.14.15...
... Locking means (13...hanger, 14...hook, 15...release lever) Fig. 2

Claims (4)

[Claims] (1) In a projection illumination device configured as a series of optical system units from the light source to the field lens, and in which the illumination unit is removably incorporated into the illumination device main body, the illumination unit is arranged from the direction of the projection optical axis of the field lens. a guide means for guiding the lighting unit in the optical axis direction while regulating the lighting unit to a normal position in a direction perpendicular to the optical axis when the lighting unit is attached to the lighting device main body; A projection illumination device comprising: a positioning means for positioning the illumination unit; and a locking means for locking the illumination unit placed in the normal position by the guide means and the positioning means on the illumination device main body. (2) Claim (1) characterized in that the guide means is a hole bored in one of the lighting device main body and the lighting unit, and a boss provided in the other and engaged with the hole.
2. Projection illumination device as described in . (3) The positioning means includes a regulating member for positioning;
The projection illumination device according to claim 1, further comprising an elastic member that applies an elastic force in the optical axis direction to the regulating member. (4) The locking means comprises a hook provided on the lighting device main body, a hook that engages with the hook, and a release lever that releases the engagement. (1
) The projection illumination device described in item 2.