JPS60207132A - Lighting device of copying machine - Google Patents

Abstract

PURPOSE:To prevent the adverse influence of heat irradiated from an irradiation lamp upon an irradiation lamp support base by providing a heat-resisting projecting means which extends from one of two reflecting plates which reflect light from the irradiation lamp to the other, and arranging the irradiation lamp support base outside of it. CONSTITUTION:A reflecting means 20 which converges light from the irradiation lamp 18 on an irradiated part consists of upper and lower reflecting plates 22 and 24; and an opening 54 for air ventilation is controlled with one-side ends of them and an opening 56 for original irradiation is controlled with the other- side ends. Further, the one-side edge part of the upper reflecting plate 22 is bent toward the lower reflecting plate 24 to form bent parts 58a and 58b, the support base of a support terminal mechanism for supporting the irradiation lamp 18 is provided outside the bent parts, and a black characteristic area having characteristics of light absorption is formed on the internal surface of the bent part 58a to prevent exposure irregularity and also eliminate the evil influence of heat irradiated directly from the irradiation lamp 18 upon the support terminal mechanism.

Description

[Detailed description of the invention] Technical fields> The present invention relates to an irradiation device in a copying machine.

<Prior Art> A copying machine such as an electrostatic copying machine is equipped with an irradiation device for irradiating an original to project an image of the original to be copied onto a photoreceptor. This type of irradiation device generally uses an irradiation lamp and the light from the irradiation lamp to illuminate the irradiated area (for example, the surface of the document).
The reflecting means is comprised of a reflecting plate having a parabolic reflecting surface. In such an irradiation device, it is necessary to exhaust the air near the irradiation lamp to the outside due to the high temperature of the irradiation lamp. Therefore, the reflector is composed of an upper reflector and a lower reflector. Both reflectors define an opening for ventilation at one end.

On the other hand, the irradiation lamp is configured to be supported by a support terminal mechanism including a support stand and a support terminal, but conventionally, the support stand of the support terminal mechanism was disposed in the ventilation opening due to installation space etc. There is.

As can be easily understood, in such an irradiation device,
The support base of the support terminal mechanism is directly exposed to the heat from the irradiation lamp through the opening, and if the support base is made of synthetic resin, there is a risk that the support base will deteriorate due to heat.

<Object of the Invention> An object of the present invention is to provide an improved irradiation device that can prevent the adverse effects of heat from an irradiation lamp on the support base.

<Summary of the Invention> According to the present invention, an irradiation lamp, a support terminal mechanism for supporting the irradiation lamp, and a reflection means for focusing light from the irradiation lamp on an irradiated part, The reflecting means includes a first reflecting member and a second reflecting member arranged at a distance from each other, and the first reflecting member and the second reflecting member each have an opening for ventilation at one end side. In the irradiation device for a copying machine, the support terminal mechanism includes a support terminal that supports the irradiation lamp and a support base that supports the support terminal, and the first reflection member has a second reflection member that is connected to the second reflection member. There is provided an irradiation device characterized in that a heat-resistant protection means extending toward the irradiation device is provided, and the support base is disposed outside the heat-resistant protection means.

<Preferred Specific Examples of the Invention> Hereinafter, specific examples of an irradiation device configured according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, which shows a portion of an electrostatic copying machine equipped with an irradiation device constructed in accordance with the present invention, the illustrated electrostatic copying machine is fully equipped with a copying machine housing 2 (partially shown). A rotary drum 4 is rotatably mounted inside the copying machine housing 2, and a photoreceptor 6 is disposed on the circumferential surface of the rotary drum 4. At the top of the copying machine housing 2, there is a transparent plate 8 for placing the document.
is installed. Transparent plate 8 is a document mounting table (not shown)
It is fixed at and reciprocated in the direction shown by arrow 10.

In the upper part of the copying machine housing 2, that is, between the rotating drum 4 and the transparent plate 8, an irradiation device 12 and an optical device 14 for irradiating the original are disposed to project the image of the original onto the photoreceptor. There is. In the illustrated embodiment, the copier housing 2
A support frame 16 is fixed inside, and the irradiation device #12 and the optical device 14 are attached to the support frame 16. The irradiation device 12 (described in detail later) includes an irradiation lamp 18 and a reflection means 20 for focusing the light from the irradiation lamp 18 onto an irradiated area, that is, a document (not shown) placed on a transparent plate 8. The reflecting means 20 includes an upper reflecting plate 22 (constituting a first reflecting member in the specific example) and a lower reflecting plate 24 (constituting a second reflecting member in the specific example). The illustrated optical device 14 includes a number of elongated optical elements (one example of such optical elements is available from Nippon Sheet Glass Co., Ltd. under the trade name 1).
The light transmitting means 26 is formed by arranging so-called rod-shaped lenses sold as self-locking microlenses. A charging corona discharger 28 is further detachably attached to the support frame 16 at its lower part.

In this electrostatic copying machine, the rotating drum 4 is rotated in the direction shown by the arrow 30, and the charging corona discharger 28
The photoreceptor 6 is charged to a specific polarity through the entire opening 34 formed in the bottom wall 32 of the support frame 16. On the other hand, light from the irradiation lamp 18 reaches the document (not shown) placed on the transparent plate 8 through an opening 32 formed in the bottom wall 32 of the support frame 16 through the reflected light transmission means 26. is projected onto the photoreceptor 6 through the photoreceptor 6, thus forming an electrostatic latent image corresponding to the original on the photoreceptor 6. The electrostatic latent image is developed into a toner image by a developing device (not shown), and this toner image is transferred onto copy paper.

Next, referring to FIGS. 2 and 3 together with FIG. 1, the irradiation device 12 and the support frame 1 to which the irradiation device 12 is attached
6 will be explained. The illustrated support frame 16 is arranged in the front-rear direction (
It has a front wall 38 and a rear wall 40 which are arranged at intervals in a direction perpendicular to the plane of paper in FIG. 1 and a direction from the lower right to the upper left in FIGS. 2 and 3. 38 and a rear wall 40 are secured to the front and rear ends of the upper surface of the bottom wall 32. An oblong hole 42 is formed in each of the front wall 38 and the rear wall 40 at one end side (left side in FIG. 3),
An elongated rectangular hole 44 on the other end side (right side in Figure 3)
is formed, and a substantially rectangular notch 46 is formed at the lower center. One ends of the front wall 38 and the rear wall 40 are bent inward, and screw holes 48 are formed in the bent portions 38a and 40a. Further, the bottom wall 32 includes a front wall 38.
A recess 50 is defined in the center portion corresponding to the notch 46 of the rear wall 40 and extending substantially over the entire width. The support frame 16 includes a charging corona discharger 28 and a light transmission means 2.
6 is installed as shown in FIGS. 1 and 2. That is, the charging corona discharger 28 is installed in a desired passage by inserting one end thereof through an opening defined by the notch 46 in the front wall 38 and the recess 50 in the bottom wall 32, and the light transmitting means 26 is It is mounted as desired by positioning its ends within holes 44 in front wall 38 and rear wall 40.

On the other hand, the reflection means 20 of the irradiation device 12 includes the irradiation lamp 18
It has an upper reflector 22 disposed above and a lower reflector 24 disposed below the irradiation lamp 18, and the upper reflector 22 and the lower reflector 24 are arranged between the front wall 38 and the rear wall 40. Fixed. The inner surface of the upper reflecting plate 22 defines a substantially parabolic reflecting surface, with the - side end extending to the left in FIG. 1, and the other end extending to the upper right in FIG. The inner surface of the lower reflector 24 also defines a substantially parabolic reflecting surface, with the - side end extending to the left in FIG. 1, and the other end extending to the upper right in FIG. It is extending. The illustrated reflecting means 20 further includes an auxiliary reflecting plate 52. The auxiliary reflection plate 52 is disposed outside the light transmission means 26 , and its negative end extends downward from the outer surface of the light transmission means 26 , and the other end extends upward from the outside of the upper end of the light transmission means 26 . .

This auxiliary reflecting plate 52 is also fixed between the front wall 38 and the rear wall 40. Because of this through hole, as can be easily understood from FIG. 1, on one side of the support frame 16 (the left side in FIG. 1), one end of the upper reflector 22 and the lower reflector A ventilation opening 54 is defined by one end of the upper reflector 24 (see also FIG. 2), and the other end of the upper reflector 22 and the other end of the auxiliary reflector 52 are defined on the upper surface of the support frame 16. An opening 56 for irradiating the original is defined by.

To explain further with reference mainly to FIG. 3, heat-resistant protection means are provided at both ends of one side of the upper reflecting plate 22. The illustrated heat-resistant protection means includes bent portions 58m and 58b formed by bending one end of the upper reflecting plate 22 downward, that is, toward the lower reflecting plate 24. This heat-resistant protection means can also be constructed by fixing downwardly extending hanging pieces to both ends of the upper reflecting plate 220. As shown in FIG. 1, the bent portions 58J1 and 58b are located inside the bent portion 38a of the front wall 38 and the bent portion 40m of the rear wall 40 with a slight distance therebetween. A support terminal machine jfR60a for supporting one end side of the irradiation rung 18 is attached to the bent portion 38a of the front wall 38 located outside the bent portion 58m, and the bent portion 58b
A support terminal mechanism 60b for supporting the other end of the irradiation lamp 18 is attached to the bent portion 40m of the rear wall 40 located outside. The support terminal mechanism 60a on one side includes a support terminal 62 and a support base 64 made of synthetic resin that supports the support terminal 62.
4, a hole 66 formed in the support terminal 62 and a support base 64;
One end of the holding collar member 70 is inserted into the hole 68 formed in the retaining collar member 70, and the setscrew 74 is inserted into the screw hole 4 of the bent portion 38m of the front wall 38 through the hole 72 formed in the retaining collar member 70.
8, it is attached to the required hole. When mounted in this manner, the intermediate portion 62m of the support terminal 62 is supported within a recess 76 formed at one end of the support base 64, and the one end 62b is located in front of the front wall 38. One end of this support terminal 62 is bent inward, and a connecting portion 62a is provided at the upper edge of the other end. This support stand 6
4 is further equipped with a temperature fuse 78 and a connection terminal 80.

The support base 64 is provided with shoulder portions 64m and 64b, and on one shoulder portion 641, the connection portion 62e of the support terminal 62 and the temperature fuse 78 are connected by screwing the set screw 82 to the shoulder portion 64m. The temperature fuse 78 is connected to one terminal 78m, and the temperature fuse 78 is connected to the other shoulder 64b by screwing a set screw 84 into this shoulder 64b.
The other terminal 78b and one end of the connection terminal 80 are connected. As shown in FIG. 1, the temperature fuse 78 is located on the upper surface of the middle part of the upper reflector plate 22, detects the temperature near the irradiation lamp 18, and is cut off when the temperature exceeds a predetermined value to prevent current from flowing to the irradiation rung 18. cut off the supply of Further, the support terminal aa60b on the other side is also connected to the support terminal 86 and the support terminal 8.
The support terminal 86 and the support base 88 include a support base 88 made of synthetic resin that supports the support terminal 86.
A hole 90 formed in the support base 88 and a hole 92 formed in the support base 88
Insert one end of the retaining collar member 94 into the retaining collar member 94, pass through the hole 96 formed in the retaining collar member 94, and screw the setscrew 98 into the threaded hole 48 of the bent portion 40m of the rear wall 4o. It is attached to the pass.

When thus mounted, the intermediate portion 86a of the support terminal 8.6 is supported within the recess 100 of the support base 88, and the one end portion 86b thereof
is located behind the rear wall 40. One end of this support terminal 86 is bent inward, and the other end 86a is bent on the support base 86.
8 (lower left in FIG. 3) to form a connecting portion. The other end of the connection terminal 8o and the other end 86a of the support terminal 86 are each connected to a power source (not shown) of the electrostatic copying machine.

The irradiation lamp 18 is connected to the support terminal 62 of the support terminal mechanism 60m.
and the support terminal 86 of the support terminal mechanism 60b. That is, one end side of the irradiation lamp 18 is connected to the hole 4 in the front wall 38.
2 and is supported by a bent portion provided at one end portion 62b of the support terminal 62, and the other end thereof is supported by a bent portion provided at one end portion 86b of the support terminal 86 through the hole 42 of the rear wall 40.

In the above-mentioned irradiation device 12, since the bent portions 58a and 58b are configured to close the ventilation opening 54 as understood from FIGS. 1 and 2, the width of the bent portions 58a and 58b is small. is preferably narrower; in the specific example, the width of the bent portion 58a is somewhat longer than the length in the longitudinal direction of the support base 64, and the width of the bent portion 58b is slightly longer than the length in the longitudinal direction of the support base 88. The width of the bent portion 58a is also longer than the width of the bent portion 58b (see FIGS. 2 and 3). And in this regard,
A black characteristic region 1o2 (see FIG. 1) having a characteristic of absorbing light is provided on the inner surface of the bent portion 58a. More specifically, the inner surfaces of the bent portions 58a and 58b act as reflective surfaces that reflect the light from the irradiation lamp 18, and therefore, if the widths of the bent portions 58a and 58b are different, the width of the original to be copied will be reduced. This causes so-called exposure unevenness to occur on the front side (the side where the bent portion 58m exists) and the rear side (the side where the bent portion 58b exists). Therefore, in the specific example, a portion of the inner surface of the bent portion 58 corresponding to the bent portion 58b (that is, an outer portion of the inner surface of the bent portion 58s1 having a width substantially equal to the width of the bent portion 58b) is used. portion) is substantially the same as the inner surface of the bent portion 58b, but the entire remaining portion of the inner surface is a black characteristic region 102. With this configuration, the upper reflector 2
The reflectances at one end and the other end of the mirror 2 are substantially equal, and the original can be exposed evenly over the actual angle.

This black characteristic area can be treated by, for example, applying black paint or
Alternatively, it is formed by fixing a plate-like member with a black surface.

In the above specific example, a black characteristic region 104 (see FIGS. 1 to 3) is further provided on the inner surface of the lower reflector 24. The black characteristic region 104 extends over substantially the entire width of the lower reflector 24 at the other end thereof.
Specular reflection from the irradiated portion is prevented from being guided to the light transmission means 26.

In the irradiation device 12 configured as described above, the irradiation lamp 1
The heat from the irradiation lamp 18 is blocked by the bent portions 58a and 58b of the upper reflector 22, and the support bases 64 and 88 of the support terminal mechanisms 60m and 60b are not directly exposed to the heat from the irradiation lamp 18. and 88 thermal deterioration can be prevented. Furthermore, between the bent portion 58a of the upper reflector 22 and the bent portion 38a of the front wall 38 to which the support stand 64 is attached,
Also, since there is a slight gap between the bent portion 58b of the upper reflector 22 and the bent portion 40a of the rear wall 40 to which the support stand 88 is attached, thermal deterioration of the support stands 64 and 88 is more effectively prevented. can be prevented.

Although specific examples of the irradiation device constructed according to the present invention have been described above, the present invention is not limited to such specific examples, and various modifications and changes can be made without departing from the scope of the present invention. .

For example, in the illustrated example, the black characteristic region 102 is provided on a portion of the inner surface of the bent portion 58& of the upper reflector 22, but if desired, the black characteristic region 102 may be provided instead of the bent portion 58a and 58& of the upper reflector 22.
A black characteristic region may be provided over the entire inner surface of b.

In addition, in the illustrated example, −(t
Although the bent portions 58a and 58b' are provided on the ill end side, bent portions extending toward the upper reflective plate 22 may be provided on both ends of the integral end side of the lower reflecting plate 24 instead. In such a case, the lower reflector 24 constitutes a first reflector, and the upper reflector 22 constitutes a second reflector.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a part of an electrostatic copying machine equipped with an irradiation device constructed according to the present invention. FIG. 2 is a perspective view showing the support frame and the irradiation device in the still image of FIG. 1; FIG. 3 is an exploded perspective view showing the support frame and irradiation device shown in FIG. 2 separately. 2... Copying machine housing 4... Rotating drum 8... Transparent plate for document placement 12... Irradiation device 14... Optical device 16... Support frame 18... Irradiation lamp 20. ...Reflecting means 22...Upper reflecting plate 24...Lower reflecting plate 54...Ventilating openings SSa and 58b...Bending portions 60a and 60b...Support terminal-like structures 62 and 86... Support terminals 64 and 88...Support stands 102 and 104...Fish color characteristic area Patent applicant: Sanda Industries Co., Ltd. Ushio Inc. Figure 1

Claims (1)

[Claims] 1. An irradiation lamp, a support terminal mechanism for supporting the irradiation lamp, and a reflection means for focusing light from the irradiation lamp on an irradiated part, the reflection means includes a first reflecting member and a second reflecting member that are spaced apart from each other, and the first reflecting member and the second reflecting member each have an opening for ventilation at one end. j in the specified copying machine
In the one-person personalization device, the support terminal mechanism includes a support terminal for supporting the irradiation lamp and a support base for supporting the support terminal, and the first reflective member has a support terminal facing the second reflective member. An irradiation device 1゜2, characterized in that an extending heat-resistant protection means is provided, and the support base is disposed on the outside of the heat-resistant protection means, the heat protection means being connected to the first reflecting member. 2. The irradiation device according to claim 1, wherein the irradiation device comprises a bent portion formed by bending one side end portion of the irradiation member toward the second reflecting member. 3. The support terminal mechanism is disposed at both ends g of the irradiation rung, and is provided at both ends of the - side end of the bent portion ii of the first reflective portion, and (2) The six-shot device according to item 2, wherein the inner surface is provided with a black characteristic area. 4° - The width of the bending part of the force is longer than the width of the bending part of the other force, and - corresponds to the other bending part of the inner surface of the bending part of 4 degrees. 4. The irradiation device according to claim 3, wherein the other portion is the black characteristic region. 5. Claims 1 to 4, wherein the inner surface of either the first reflective member or the second reflective member is provided with a black characteristic region extending over substantially the entire width thereof. The irradiation device described in any of paragraphs. 6. The irradiation lamp is an original irradiation lamp that irradiates the original, the first reflecting member is an upper reflecting plate disposed above the original irradiating lamp, and the second reflecting member is an upper reflecting plate disposed above the original irradiating lamp. The irradiation device according to claim 5, further comprising a lower reflector disposed below the document irradiation lamp, and the black characteristic region is provided at the other end of the inner surface of the lower reflector. .