JP2935314B2 - Overhead projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead projector, and more particularly to an overhead projector in which a unit such as a timer is fitted on a surface of a main body case of the overhead projector.

[0002]

2. Description of the Related Art Some overhead projectors are provided with a timer. This type of overhead projector is convenient because when explaining using the overhead projector, the presenter can check the time while explaining.

Conventionally, the timer is fitted into a recess for mounting a unit such as a timer formed on a surface of a main body case of an overhead projector such that the surface of the timer is substantially flush with the surface of the main body case.

[0004]

However, the conventional overhead projector has a disadvantage that a unit such as a timer which requires replacement or resetting of a battery cannot be easily removed from the main body case. The present invention has been made in view of such circumstances,
An object of the present invention is to provide an overhead projector capable of easily taking out a unit such as a timer from a main body case.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an overhead projector in which a timer or other unit is fitted into a timer or other unit mounting recess formed in the surface of a main body case of the overhead projector. In the above, the unit is removably fitted so that the surface thereof is substantially flush with the surface of the main body case, and pushes a unit such as a timer into the inside of the main body case corresponding to the unit mounting recess. Means are provided.

[0006]

According to the present invention, the unit such as the timer is pushed out of the unit mounting recess by using the pushing means, so that the unit can be easily taken out of the main body case.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an overhead projector according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an overhead projector 1 according to the present invention.
It is a perspective view which shows the external appearance of the use state of 0. The main body 12 of the overhead projector 10 has a base 14 and an upper lid 16, and is formed in a hexagonal box body. A transparent Fresnel plate 18 is fixed to the upper lid 16, and a transparent document (not shown) is placed on the upper surface of the Fresnel plate 18 while maintaining flatness. A cover 20 shown in FIG. 2 is put on the Fresnel plate 18 to prevent dust and the like from adhering to the upper surface when the overhead projector 10 is not used.

As shown in FIG. 3, a light source unit 22, a reflection mirror 24 and the like are installed in the base 14. The light source unit 22 includes a reflector 28 at the rear and a condenser lens 3 at the front with the pair of lamps 26 and 26 interposed therebetween.
0 is arranged. Light from the lamps 26, 26 and the reflector 28 is collected by the condenser lens 30 toward the reflection mirror 24, reflected by the reflection mirror 24, and emitted toward the Fresnel plate 18 shown in FIG. Thereby, the transparent document is illuminated.

A fan 32 is disposed near the light source unit 22, as shown in FIG. This fan 32
Are arranged inside an exhaust hole 36 formed in the tapered side surface portion 34 of the base 14 shown in FIG. 1 and FIG. 2, and the intake holes 38, 38 formed on the side surface of the base 14 by being rotated.
Thus, outside air is sucked into the main body 12, and the air heated in the main body 12 can be exhausted to the outside through the exhaust holes 36. Thereby, the light source unit 22, the power supply unit (transformer) not shown, and the like are cooled.

At the rear of the base 14 on the right side surface shown in FIG. The arm 40 is bent obliquely at a corner portion 40 a and formed in a shape along the side surface shape of the main body 12. A projection head 44 is attached to the tip of the arm 40.
When the arm 40 is rotated to the upright position shown in FIG. 1, it is positioned at a predetermined projection position directly facing the Fresnel plate 18.

The projection head 44 includes a Fresnel plate 18.
Is provided with a projection lens 46 for enlarging and projecting the light condensed by the above, that is, light transmitted through the transparent original. A projection mirror 48 is provided above the projection lens 46. The projection mirror 48 is tilted by 45 ° with respect to the optical axis of the projection lens 46, and can reflect light from the projection lens 46 toward a screen (not shown) and project the light on the screen. The projection mirror 48 is fixed to a mirror holder 50, and the mirror holder 50 is mounted on the upper surface of the projection head 44 so as to be able to move up and down.

On the other hand, a rectangular timer 52 is attached to the upper lid 16. The timer 52 is set so that its surface is substantially flush with the surface of the upper lid 16.
Is fitted in a not-shown recess for mounting a timer. Further, a timer push-out pin 54 is provided inside the upper lid 16 corresponding to the mounting position of the timer 52 as shown in FIG. The pin 54 is urged by a spring (not shown) in a direction opposite to the pushing direction, and a distal end of the pin 54 communicates with the timer mounting recess from the inside of the upper lid 16.

In order to take out the timer 52 from the upper lid 16 with the overhead projector 10 configured as described above, the pin 54 shown in FIG. 4 is pushed in the direction of the arrow in FIG. Push it out from the timer mounting recess. Thereby, the timer 52 can be easily removed from the upper lid 16. Further, even if the timer 52 is strongly pushed from above (front side) during the operation, it does not come off.

In order to mount the timer 52 whose battery has been replaced on the upper cover 16, the timer 52 may be fitted into the timer mounting recess as it is. At this time, the pin 54
Is returned to the original position by the biasing force of the spring,
The timer can be fitted smoothly. Therefore, according to the embodiment, the timer 52 can be easily removed from the upper lid 16 as compared with a conventional overhead projector that does not have a timer removal unit.

In this embodiment, the taking out of the timer 52 has been described. However, the present invention is not limited to this, and the present invention can be applied to any unit that requires battery replacement or reset.

[0016]

As described above, according to the overhead projector of the present invention, means for pushing out a unit such as a timer is provided inside the main body case corresponding to the unit mounting recess, and the unit is united using this means. Since the unit is pushed out from the mounting recess, the unit fitted so as to be flush with the surface of the main body case can be easily taken out from the main body case.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of an overhead projector according to the present invention.

FIG. 2 is a perspective view showing a state in which the overhead projector according to the present invention is not used.

FIG. 3 is a perspective view of a base applied to the overhead projector according to the present invention.

FIG. 4 is a perspective view of a back surface of an upper lid applied to the overhead projector according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Overhead projector 12 ... Main body 14 ... Base 16 ... Top lid 18 ... Fresnel plate 22 ... Light source unit 24 ... Reflection mirror 40 ... Arm 46 ... Projection lens 52 ... Timer 54 ... Pin

Continuation of front page (72) Inventor Shigeki Endo 3-1-146 Izumi, Asaka-shi, Saitama Fuji Photo Film Co., Ltd. (56) References JP-U 2-64933 (JP, U) JP-A 57-170836 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 21/132

Claims (1)

(57) [Claims] To 1. A overhead body case timer such unit mounting recess formed in a surface portion of the projector, in the overhead projector timer or the like unit is fitted, the unit and the surface of its surface the main body case About the same
An overhead projector, wherein means for pushing out a unit such as a timer is provided inside the main body case corresponding to the unit mounting recess so as to be detachably fitted so as to be on one surface .