JPH0398043A - Illuminator for copying machine - Google Patents

Abstract

PURPOSE:To eliminate the fear of electrical shock and to perform adjustment with high accuracy by conducting out a lead wire connected to a filament from the end part of a tubular electric lamp and providing an elastic member which presses two other crossing surfaces of a lamp holder pressed by an adjusting screw. CONSTITUTION:The lead wire 20 connected to the filament 2a is conducted out from the end part of the tubular electric lamp 2 and the square lamp holder 21 is provided on the end part of the lamp 2. A fixed wall 22 opposed to the two crossing surfaces of the lamp holder 21 is formed on the side plate of a reflection mirror body 1 and the adjusting screws 24 are screwed and inserted into the fixed wall 22 respectively. The two surfaces of the lamp holder 21 are respectively pressed by the adjusting screws 24. Then, the elastic member which supports the two other crossing surfaces of the lamp holder 21 pressed by the adjusting screws 24 is provided on the side wall. Thus, the fear of electrical shock is eliminated. An insulating protective member is not necessitated and an equipment can be miniaturized. The work for adjusting reflection characteristic is executed in a lighting state obtained by applying a current and adjustment with high accuracy is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an illumination device for a copying machine in which a light source is attached to a side plate of a reflecting mirror body having a substantially gutter shape.

(Prior Art) Conventionally, as shown in FIG. 4, an illumination device such as an electronic copying machine copies a copy original 4 placed on a translucent mounting plate 3 made of glass or the like. It is constructed by housing a tube-shaped light bulb 2 made of a halogen light bulb or the like approximately at the focal point of a long reflecting mirror body 1 in the shape of a gutter.

The reflecting body 1 has the entire inner surface as a reflecting surface, and has a main reflecting part 8 having a substantially gutter shape and an auxiliary reflecting part 9 having a slit 5.
For example, it is integrally formed by molding, bending press, etc.

Further, a tube-shaped light bulb 2 such as a halogen bulb is a well-known type in which a filament 2a is housed inside a tube-shaped glass tube on the tube axis, and the filament 2a has light-emitting parts and non-light-emitting parts arranged alternately. It is configured so that the illuminance distribution in the tube axis direction is approximately uniform.

The light emitted from such a tube-shaped light bulb 2 is reflected by the reflecting mirror body 1 and is reflected by the copy original 4 placed on the translucent mounting plate 3.
The light is focused on the bottom surface of the object and irradiated with it.

The light reflected by this copy original 4 passes through the slit 5.
From there, an image is formed on a photosensitive drum 7 via an optical system 6 such as a lens or a prism.

By the way, both longitudinal ends of the reflecting mirror body 1 are as follows.
It is covered with a side plate 11 (only one of which is shown) that stands up from the chassis 10, and is fixed to this side plate 11. This side plate 11 is formed with an insertion hole or cutout-shaped insertion groove 12 through which the end of the tube-shaped light bulb 2 is inserted.
The end of the tube-shaped light bulb 2 is guided out of the side plate 11 through the insertion groove 12.

A cap is provided at the tip of the end of the tube-shaped light bulb 2, and a power supply terminal made of a conductive metal plate is pressed onto the cap. For this reason, the lamp is mechanically held by the power supply terminal and electrically connected.

(Problems to be Solved by the Invention) However, in the case of a copying machine having the above configuration, the power supply terminal made of a conductive metal plate that mechanically holds the tube-shaped light bulb 2 and electrically connects it is exposed. Since there is a risk of electric shock, a structure is adopted in which this is covered with an insulating protection member.

In such a structure, the insulation protection member has a large structure and requires a large installation space, resulting in an increase in the size of the entire device.

Further, the reflector body 1 has a complicated cross-sectional shape, which causes variations in the molded shape, and even in the tube-shaped light bulb 2, the position of the filament 2a and the attachment position vary.

Originally, the light 1.1 emitted from the tube-shaped light bulb 2 and reflected by the reflector 1 is reflected by the characteristic A shown in FIG. The light must be focused in such a way. However, when the above-mentioned variations occur, the reflection characteristics are affected, resulting in, for example, the light condensing characteristics as shown by characteristic B in FIG. 4, resulting in problems such as an insufficient amount of light for copying.

In order to adjust this, conventionally, the position of the tube-shaped light bulb 2 is changed by adjusting the position of the power supply terminal made of the conductive metal plate to obtain a predetermined reflection characteristic.

However, when making adjustments like this, the power supply terminals are exposed, so there is a risk of electric shock if the power is turned on.
In the end, the lighting is not turned on by energizing, but is adjusted visually, which means that highly accurate adjustment is not possible.

The present invention provides a copying machine that eliminates the risk of electric shock, eliminates the need for insulating protection members, allows the equipment to be made smaller, and allows adjustment of reflection characteristics to be performed with electricity turned on, allowing for highly accurate adjustment. The purpose is to provide a lighting device.

[Structure of the invention]

(Means for Solving the Problems) The present invention leads out a lead wire connected to a filament from an end of a tube-shaped light bulb, provides a square lamp holder at the end of this tube-shaped light bulb, and A fixed wall facing the two intersecting sides of the lamp holder is formed on the side plate of the lamp holder, and adjusting screws are screwed into each of the fixed walls.These adjusting screws press the two sides of the lamp holder, and The lamp holder is characterized in that the side wall is provided with an elastic member that supports the other two intersecting surfaces of the lamp holder that are pressed by the adjustment screw.

(Function) According to the present invention, since the lead wire connected to the filament inside the bulb is led out from the end of the tube-shaped light bulb, there is no need to provide an external power supply terminal made of conductive metal, and there is no fear of electric shock. At the same time, the insulating protection member is no longer necessary, making it possible to downsize the instrument. Also, when the two sides of the rectangular lamp holder provided at the end of the tube-shaped light bulb are pushed by adjusting screws, the elastic member bends and allows the lamp holder to be displaced, thereby adjusting the position of the tube-shaped light bulb. Therefore, it is possible to adjust the light collection characteristics of the light-transmitting mounting plate. In this case, the reflection characteristics can be adjusted in the lighting state by energization, and highly accurate adjustment can be performed.

(Example) The present invention will be described below based on an example shown in FIGS. 1 and 2.

In this embodiment, those having the same structure as the conventional one are given the same numbers and their explanations are omitted.
, the tube-shaped light bulb 2, the chassis 10, the side plate 11 that stands up from the chassis 10 or is integrally attached to the reflector 1, and the lamp insertion groove 12 may be the same as those of the conventional one.

A lead wire 20 is connected to the inner filament 2a from the both end sealing parts (only one end is shown) of the tube-shaped light bulb 2.
has been derived. This lead wire 20 is preferably a coated cord.

Rectangular lamp holders 21 are attached to both ends (only one is shown) of the tube-shaped light bulb 2, respectively. The lamp holder 21 of this embodiment also serves as a base, is made of ceramic, for example, and has a cylindrical portion 21a integrally protruding from one end of a square portion. The rectangular lamp holder 21 is placed over the end of the tube-shaped light bulb 2, and is integrally joined to the end of the tube-shaped light bulb 2 with an adhesive (cement, not shown). In this case, the cylindrical portion 2
The lead wire 20 is led out from 1a.

The rectangular lamp holders 21 attached to both ends of such a tube-shaped light bulb 2 are led out to the outside of the end of the reflector 1 through lamp insertion grooves 12 formed in the side plate 11 that covers the end of the reflector 1. As a result, the filament 2a portion inside the tube-shaped light bulb 2 is accommodated in the reflector body 1.

The side plate 11 has a lamp holder 2 projecting to the outside.
A fixing plate 22 is provided opposite to the top surface and one side of 1. This fixing plate 22 can be cut and raised integrally from the side plate 11, but the flange portion 23 formed at one end
is constructed by welding to the side plate 11.

Fixed walls 22a and 22b are formed on the fixed plate 22, and these fixed walls 22a and 22b are provided with adjusting screws 2, respectively.
4 and 25 are screwed in.

The tips of these adjustment screws 24 and 25 come into contact with the top surface and one side of the lamp holder 21, respectively, and by screwing these adjustment screws 24 and 25, the lamp holder 21 is pushed downward and horizontally. ing.

A support plate 26 is provided below the lamp holder 21. This support plate 26 can be cut and raised integrally from the side plate 11, but the flange portion 2 formed at one end
7 is welded to the side plate 11.

A leaf spring 28 is fixed to this support plate 26. The leaf spring 28 has a substantially U-shape, for example, and the bottom thereof is connected to the support plate 2.
6, one end 29a is in surface contact with the lower surface of the lamp holder 21 to elastically support the lower surface of the lamp holder 21, and the other end 29b is fixed to the lower surface of the lamp holder 21. The lamp holder 21 is in surface contact with the other side surface and elastically presses the other side surface of the lamp holder 21 .

Therefore, the leaf spring 28 constitutes an elastic member of the present invention, and the adjustment screws 24 and 25 allow the lamp holder to
When 1 is pushed downward and horizontally, leaf spring 2
The elastic pieces 29a and 29b of 8 are elastically deformed to allow the lamp holder 21 to be displaced.

Note that the opposite end of the reflector 1 also has a similar configuration, although not shown.

The operation of the embodiment with such a configuration will be explained.

A tube-shaped light bulb 2 is housed in the reflector body 1, and a lamp holder 21 attached to the end of the tube-shaped light bulb 2 is inserted into the insertion groove 1 of the side plate 11.
Make it stick out from 2. Then, the elastic pieces 29a, 29 of the leaf spring 28
b, and in this state, each of the fixed walls 2 of the fixed plate 22
Adjustment screws 24 and 25 screwed into 2a and 22b are screwed forward, and the tips of these adjustment screws 24 and 25 press against the top surface and one side of the lamp holder 21.

Thereby, the lamp holder 21 is held between the elastic pieces 29a, 29b of the leaf spring 28 and the adjustment screws 24, 25.

In this state, if the light condensing characteristics on the transparent mounting plate 3 shown in FIG. 4 become undesirable light condensing characteristics as shown by B,
Adjustment screws 24 and 25 are operated to move lamp holder 21 vertically and horizontally.

Then, the tube light bulb 2 is moved vertically and horizontally, so
The reflection characteristic changes and can be adjusted to a predetermined light condensing characteristic as shown by characteristic A in FIG.

In the case of this embodiment, power is supplied to the filament 2a of the tube-shaped light bulb 2 by connecting the lead wire 20 led out from the end of the tube-shaped light bulb 2 to a power source, so it is not necessary to supply power to the filament 2a of the tube-shaped light bulb 2. There is no need to provide a power supply terminal made of conductive metal.

Therefore, there is no need to worry about electric shock, and since there is no need for an insulating protection member covering the power supply terminal, no installation space is required, and the entire device can be made smaller.

Further, the lamp holder 21 provided at the end of the tube-shaped light bulb 2 has a rectangular shape, and two intersecting sides are provided with adjustment screws 24 and 2, respectively.
5, the elastic pieces 29a and 29b of the leaf spring 28 pressing the other two intersecting surfaces are bent to displace the lamp holder 21 vertically and horizontally, so that the tube-shaped light bulb 2 can be moved reliably. I can do it. That is, adjusting screw 2
4 and 25 and the elastic pieces 29a and 29b of the leaf spring 28 press against the flat surface of the lamp holder 21, respectively.
The lamp holder 21 is securely supported by the adjustment screws 24 and 25 during and after the above position adjustment.
Also, the plate spring 28 will not slip from the elastic pieces 29a, 29b and be undesirably displaced.

Furthermore, while adjusting the position of the tube-shaped light bulb 2, the reflection characteristics can be adjusted while the tube-shaped bulb 2 is turned on by energizing it, and the position can be adjusted while checking the light-condensing characteristics. This allows for highly accurate adjustment.

Note that the present invention is not limited to the above embodiments.

That is, in the above embodiment, a case was explained in which the rectangular lamp holder 21 provided at the end of the tube-shaped light bulb 2 is made of ceramic and also serves as the cap base.
The present invention is not limited to this, and may have a configuration as shown in FIG. 3 as another embodiment, for example.

In this embodiment, a lamp holder 40 and a cap base 41 are constructed separately, and the cap base 41 is made of ceramic and has a cylindrical shape, and is bonded to the end of the tube-shaped light bulb 2 with adhesive (cement). integrated. The lamp holder 40 is made of resin or a metal plate, and has a rectangular shape that covers the cap base 41.

The cylindrical portion 41a of the base base 41 is inserted into the through hole 42 formed in the lamp holder 40, and the lamp holder 40 is joined to the base base 41 via an adhesive (cement).

Even with such a configuration, the same effects as the embodiment shown in FIG. 1 can be achieved.

Further, the present invention is not limited to using the leaf spring 28 as the elastic member, but may be an elastic member such as a coil spring or rubber.

Furthermore, the relationship between the reflector 1, the chassis 10, and the side plates 11 is not limited to that in the above embodiment; the reflector and the side plates may be integrally formed, or the reflector or the side plates may be attached to the chassis. It may also be something.

Alternatively, the copying machine may have a structure in which a reflecting mirror body and a side plate are attached to the casing of the copying machine without a special chassis.

〔Effect of the invention〕

As explained above, according to the present invention, the lead wire connected to the filament inside the bulb is led out from the end of the tube-shaped bulb, so there is no need to provide an external power supply terminal made of conductive metal as in the conventional case. , there is no need to worry about electric shock, and the equipment can be made more compact since there is no need for an insulating protection member. Also, when two of the rectangular lamp holders installed at the end of a tube-shaped light bulb are pushed with adjusting screws, the elastic members pressing the other two sides bend and allow the lamp holder to displace, thereby causing the tube shape The position of the bulb can be adjusted and therefore the light collection properties on the translucent mounting plate can be adjusted. In this case, the reflection characteristics can be adjusted in the lighting state by energization, and highly accurate adjustment can be performed. Moreover, since the adjusting screw and the elastic member each push against the flat surface of the rectangular lamp holder, the support is stable.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a perspective view showing one side of the lighting device, FIG. 2 is a perspective view of the main part, and FIG. 3 is an embodiment of the invention. FIG. 4 is an exploded perspective view of the end of the lamp showing an embodiment of the present invention, and FIG. 4 is a sectional view of the entire lighting device showing the conventional technique. DESCRIPTION OF SYMBOLS 1...Reflector body, 2...Tube-shaped light bulb, 3...Translucent mounting plate, 4...Copy manuscript, 10...Chassis, 11
...Side plate, 12...Lamp insertion groove, 20...Lead wire, 21...Lamp holder 22...Fixing plate,
22a, 22b... Fixed wall, 24, 25... Adjustment screw, 26... Support plate, 28... Leaf spring, 29a, 2
9b...Elastic piece, 40...Lamp holder

Claims (1)

[Scope of Claims] A tube-shaped light bulb is housed in a reflecting body that is approximately gutter-shaped and has a side plate at the end, and the light emitted from the tube-shaped bulb is reflected by the reflecting body. In a lighting device for a copying machine that irradiates light onto a copy original placed on a translucent mounting plate, a lead wire connected to a filament is led out from the end of the tube-shaped bulb, and the tube-shaped bulb is A rectangular lamp holder is provided at the end, and a fixed wall is formed on the side plate of the reflector that faces the two intersecting sides of the lamp holder, and adjustment screws are screwed into each of the fixed walls. The illumination for a copying machine is characterized in that the side wall is provided with an elastic member that presses the other two intersecting sides of the lamp holder that are pressed by the adjusting screw. Device.