JPS6114039Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that has both a lamp switching mechanism in a light source section in which two or more lamps are arranged and an interlock mechanism when replacing lamps.

Conventionally, overhead projectors (OHP) and the like have been used for purposes such as being able to continue projecting even if the bulb burns out during projection, or being able to select the brightness of the lighting. Some light sources have multiple lamps arranged in a switchable manner, and in order to ensure safety when replacing lamps, the power is turned off when the lid of the light source is opened. An interlock switch is provided for this purpose.

In this way, in the past, the lamp switching device and the interlock device were arranged without any connection, leading to an increase in the number of parts, complicated wiring, and an increase in the size of the light source. .

In view of the above-mentioned conventional problems, the present inventor has devised the present invention in order to effectively solve the problems.The purpose of the present invention is to provide a lamp switching device and an interlock device for lamp replacement. It is an object of the present invention to provide a lamp switching/interlock device which can simplify the mechanism by linking the lamps.

In order to achieve such an object, the present invention has a plurality of lamps switchably disposed within a light source section provided with a lid through a support member, and a movable shaft formed with a cutout section of the light source section is slidable. A member for opening/closing the lid body is fixed to the movable shaft, and a lamp switching lever shaft that moves in and out of the notch as the movable shaft slides is fixed to the support member. By entering and exiting the shaft notch
The gist of this is that the light source is equipped with a micro switch that turns the lamp on and off.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

Figure 1 shows a reflective type using the device according to the present invention.
This is an overall perspective view of the OHP, and the OHP 1 has a Fresnel reflector 3 or a combination of a Fresnel lens and a reflector fitted on the top surface of a base 2 that is approximately box-shaped, and translucent materials are placed on top of this. I try to do that. Then, a joint part 4 is attached to the end of the base 2.
A hollow support 5 is rotatably attached via the
A head section 8, which is a light source section, is supported at the tip of this support column 5, which is equipped with a projection lens 6 and a projection reflector 7.

2 and 3 are a plan view and a side view showing the internal structure of the head section 8. An opening 9 for illumination is formed in the bottom surface of the head section 8, and support is provided around the opening 9. 10 surrounds the supporting plate 10, and a shaft 1 is inserted between the supporting plates 10.
1 is installed so as not to cover the opening 9. A support member 12 is slidably attached to this shaft 11, and lamps 13, 13 are attached to this support member 12.
is fixed and the support member 12 moves along the axis 11 so that one of the lamps 13 faces the opening 9.

Further, a support plate 1 is provided on the back side of the side plate 14 of the head portion 8.
5 is attached, and a movable shaft 16 is slidably inserted through this support plate 15. This movable shaft 16 is formed with notches 17, 17, and the notches 17 and the movable shaft 1
It is continuous with the peripheral surface of 6 by an inclined surface 18.
An opening/closing operation member 21 of the lid body 20 is fixed to the tip of the movable shaft 16 via a nut 19, and a spring 22 is attached between the operation member 21 and the support plate 15.
It is reduced in size.

That is, as shown in FIG.
It is integrally fixed to a guide cam 25 whose side surface is approximately semicircular and has a notch 24 formed in a part, which is rotatably inserted into a shaft 23 installed on the upper part of the shaft 23. It is biased clockwise, and its clockwise rotation is restricted by the distal end 21a of the opening/closing operation member 21 being locked in the notch 24.

Further, a lever shaft 27 for lamp switching is fixed to the side surface of the support member 12. This lever shaft 27 is provided with a lever knob 28 at its tip, and this knob 28 projects outward from a channel-shaped opening 29 formed in the side plate 14 of the head portion 8 shown in FIG. Then, the lever shaft 27 is pulled downward by the sling 30 so that the lever shaft 27 always comes into contact with the movable shaft 16.

Furthermore, a movable shaft 16 and a support member 12 within the head portion 8
Lamp lighting micro switches 31, 31 corresponding to the two lamps 13, 13, respectively, are provided between the
is arranged so that when the lever shaft 27 fits into the notches 17, 17 of the movable shaft 16, it is turned on by pressing the switch piece of the micro switch, and when it comes out of the notch 17, it is turned off. .

The operation of the apparatus constructed as above will be described below.

First, let's talk about lamp switching.
As shown in FIG. 3, when you want to use the right lamp 13 from the left lamp 13, lift the lever shaft 27, take out the lever shaft 7 from the right notch 17, and open the opening. The lever shaft 27 is moved to the left along the section 29. Then, since this lever shaft 27 is fixed to the support member 12, the support member 1
2 also slides to the left along the shaft 11, the lamp 13 on the right faces onto the opening 9, and then the lever shaft 27 is fitted into the notch 17 on the left by the tension of the spring 30. As a result, the micro switch 31 on the left side is turned on, and the lamp 13 on the right side lights up. This operation completes lamp switching.

Next, regarding lamp replacement, from the state shown in FIG. 2 and FIG. Move it to the left against the Then, the tip 21a of the opening/closing operation member 21 comes off the notch 24 of the guide cam 25, and the lid 20 is rotated clockwise by the elastic force of the spring 26, opening the lid 20 as shown in FIG. state.

Simultaneously with the opening operation of the lid body 20, the movable shaft 16 slides to the left, so the lever shaft 27, which had been fitted into the notch 17, rides on the circumferential surface of the movable shaft 16 along the inclined surface 18, and the micro The switch 31 becomes OFF and no current flows. Therefore, the lamp 13 can be replaced safely.

Incidentally, the above description is merely an example of the implementation of the present invention, and the number of lamps is arbitrary, and the number of cutouts may be the same as the number of lamps. Further, the opening/closing mechanism of the lid body 20 is also limited to the above, and the lid body may be rotated by the movement of the operating member 21, for example, using a rack and pinion.

As is clear from the above description, according to the present invention, in a light source unit in which a plurality of lamps can be switched by moving a lever shaft, a movable shaft having a plurality of notches formed in the light source unit can be slidably moved. and a member for opening/closing the lid of the light source section is fixed to this movable shaft,
In addition, a micro switch for lamp lighting, which is turned on and off by moving a lever shaft fixed to the support member of the lamp in and out of the notch, is disposed in the light source section, and the lever shaft is moved from the notch to the notch. The lamps are switched by moving the lamp to , and the micro switch is turned off by operating the lid opening/closing operation member, so there is no need for a separate interlock switch, etc., and the lid can be opened easily. At the same time, the current can be cut off, the number of parts can be reduced, the lamp can be replaced safely and reliably, and the light source can be made more compact, among other advantages.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, and FIG. 1 is an overall perspective view of an OHP equipped with a lamp switching and interlock device according to the present invention, and FIG.
The figure is a plan view showing the internal mechanism of the light source section of the OHP, FIG. 3 is a side view showing the internal mechanism, and FIG. 4 is a side view similar to FIG. 3 showing the open/closed state. In addition, in the drawing, 8 is a light source part, 12 is a support member, and 13
1 is a lamp, 16 is a movable shaft, 17 is a notch, 20 is a lid, 21 is an opening/closing operation member, 27 is a lever shaft, and 31 is a micro switch.

Claims (1)

[Scope of utility model registration request] A plurality of lamps are switchably disposed within a light source section provided with a lid via a support member, a movable shaft is slidably disposed within the light source section and has a notch formed in a portion thereof; A lid opening/closing operation member fixed to a movable shaft and attached to the support member,
The lever shaft moves in and out of the notch as the movable shaft slides, and when the lever shaft fits into the notch, it is pressed and turned on, and the lever shaft is taken out from the notch.
A lamp switching and interlock device consisting of a lamp flashing micro switch with a switch piece for turning off.