JPS6114017Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arrow light device for pointing at a suitable location on charts, graphs, etc.

Conventional devices of this kind are known to have a configuration in which, for example, a V-shaped filament light bulb is projected using a plano-convex lens, but the plano-convex lens has large chromatic aberrations and spherical aberrations, and has the disadvantage that a clear and sharp arrow image cannot be obtained. Ta.

Therefore, the present invention aims to provide an arrow light device that uses a concave mirror instead of a plano-convex lens to obtain a bright, sharp arrow image with small chromatic aberration and spherical aberration.

The apparatus of the present invention will be described in detail below with reference to the embodiments shown in the drawings. Reference numeral 1 denotes a main body of the apparatus formed into a rectangular cylindrical shape, and a threaded cylinder 2 having a female thread is integrally attached to the center of the rear wall 1a. A handle 3 having a threaded tube portion 3a on the outer periphery of the tip portion is screwed into the threaded tube 2. A concave mirror 4 is integrally attached to the tip of the handle 3, and the position of the concave mirror 4 can be adjusted by rotating the handle 3 with respect to the device body 1. 3b is a stopper provided on the handle 3 so as to come into contact with the end surface of the threaded cylinder 2. An arrow board 5 is integrally provided on the front wall 1b of the main body 1 so that a transparent arrow window 5a is positioned at the focal point of the concave mirror 4. Further, a socket 6 is fixed to the front wall 1b with a mounting screw 6a so that its position can be adjusted.
It is located at the center of the optical axis in front of the camera.
The light source bulb 7 is covered with a cover body 8 on its top, bottom, left and right, and the arrow board 5 is located behind the cover body 8. The cover body 8 is attached by fixing a mounting plate part 8a extending downward from the rear of the bottom plate part together with the socket 6. Also,
By providing a condenser lens 9 between the arrow window 5a and the light source bulb 7, a substantial optical distance is provided between the arrow window 5a and the light source bulb 7,
It is possible to prevent the filament image of the light source bulb 7 from appearing within the projected image of the arrow. Further, a ventilation cover 10 for ventilation is fixed to the front part of the device main body 1 that covers the light source bulb 7 with a mounting screw 10a. Reference numeral 11 denotes a micro switch provided in the device main body 1, and a push button 11 protrudes from the rear wall 1a onto the handle 3.
The light source bulb 7 is configured to be turned on and off using a. In addition, it is of course possible to provide a colored filter for the projected image of the arrow between the arrow window 5a and the reflecting mirror 4 or in another projection optical path.

To explain how the device of the present invention having the above configuration is used, the arrow window 5a located at the focal point of the concave mirror 4 is irradiated by the light source bulb and is reflected by the concave mirror 4, and the light source bulb 7 is reflected as a substantially parallel beam. Cover body 8
A clear and sharp arrow image can be projected onto the target surface of a remote chart or the like through the transparent space around the outer periphery of the arrow. Therefore, by holding the handle 3, you can freely set a target and project a bright arrow image, and by rotating the handle 3,
By changing the focal position of the concave mirror, a proper arrow image can be obtained.

As described above, according to the device of the present invention, it is not only possible to freely hold the handle 3 to map a bright and clear arrow image to a desired target using a concave mirror with small chromatic aberration and spherical aberration, but also to hold the handle 3 on the device body. 1, it is possible to properly adjust the focal position of the concave mirror 4 at its tip.In addition, due to the structure of the device, there is no need to support the concave mirror 4 with a special support device, and the reflection The present invention provides an arrow light device that can be supported with a simple configuration that matches the arrangement of the optical system and makes full use of the characteristics of a concave mirror, and has many practical benefits.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinally sectional front view of one embodiment of the device of the present invention, FIG. 2 is a partially omitted plan view, and FIG. 3 is a right side view thereof. 1: device body, 3: handle, 4: concave mirror, 5: arrow board, 7: light source bulb.

Claims (1)

[Scope of utility model registration request] A handle 3 is provided on the rear wall of the device main body 1 so as to be adjustable forward and backward, and the handle 3 is located inside the device main body 1.
A concave mirror 4 is attached to the tip of the concave mirror 4, and an arrow board 5 having a transparent arrow window is provided at the focal point of the concave mirror 4, and a light source 7 is provided in front of the arrow board 5 to direct the reflected light of the arrow image to the arrow board. 5. An arrow light device characterized in that it is configured to project light through the outer peripheral transparent space of No. 5.