JPH0444731B2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> 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 includes an irradiation lamp and a reflection means for focusing the light from the irradiation lamp on an irradiated area (for example, the document surface), and the reflection means is a reflection plate having a parabolic reflection surface. It consists of In the Karuru irradiation device, the air near the irradiation lamp needs to be exhausted 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 supported by a support terminal mechanism including a support stand and a support terminal,
Conventionally, the support base of the support terminal mechanism has been disposed in the ventilation opening due to the mounting space and the like.

In such an irradiation device, as is easily understood, the support base of the support terminal mechanism is directly exposed to the heat from the irradiation lamp through the opening, and the support base is made of synthetic resin. If this happens, there is a risk that this support will deteriorate due to heat.

<Object of the invention> The present invention focuses on the point that the reflecting means defines a ventilation opening at one end thereof, and improves the reflecting means in relation to the support base, thereby achieving an extremely simple structure. It is an object of the present invention to prevent bad shadows caused by heat on the support base by the configuration, and without impairing the reflection function of the reflection means in any way.

<Summary of the Invention> According to the present invention, the present invention includes 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 an irradiation device for a copying machine that is attached to a support frame to define It includes a terminal and a support base that supports the support terminal, and at both ends of the first reflective member on the one side end side,
Heat-resistant protection means extending toward the second reflective member are provided, and each of the heat-resistant protection means bends both ends of the one side end of the first reflective member toward the second reflective member. The support base is disposed on the outside of each of the bent portions, and the inner surface of at least one of the bent portions is coated with black. An irradiation device in a copying machine is provided that is provided with a characteristic area.

<Preferred Specific Example of the Invention> Hereinafter, a specific example of an irradiation device constructed 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 with an illumination device constructed in accordance with the present invention, the illustrated electrostatic copying machine includes a copying machine housing 2 (partially shown). A rotary drum 4 is rotatably mounted in the copying machine housing 2, and a photoreceptor 6 is disposed on the circumferential surface of the rotary drum 4. A transparent plate 8 for placing an original is disposed on the upper part of the copying machine housing 2. Transparent plate 8 is fixed to a document table (not shown) and is reciprocated in the direction indicated by mark 10.

The upper part of the copying machine housing 2, that is, the rotating drum 4
An irradiated portion 12 and an optical device 14 for irradiating an original to project the image onto the photoreceptor of the original are arranged between the transparent plate 8 and the transparent plate 8 . In the illustrated example, a support frame 16 is fixed to the copying machine housing 2, and an irradiation device 12 and an optical device 14 are attached to the support frame 16. The irradiation device 12 (described in detail later) includes an irradiation lamp 18 and an irradiation lamp 18
and a reflecting means 20 for converging the light from the irradiated area, that is, the original (not shown) placed on the transparent plate 8, and 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 the 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 sold by Nippon Sheet Glass Co., Ltd. under the trade name "Self-Oc Micro Lens").
The light transmitting means 26 is formed by arranging so-called rod-shaped lenses. A charging roller discharger 28 is further detachably attached to the lower part of the support frame 16.

In the electrostatic copying machine as described above, the rotary drum 4 is rotated in the direction shown by the arrow 30, and the charging corona discharge 28 charges the photoreceptor 6 through the opening 34 formed in the bottom wall 32 of the support base 16. Charge to a specific polarity. On the other hand, from the irradiation lamp 18 to the transparent plate 8
The light reaching the original (not shown) placed thereon is projected onto the photoreceptor 6 through the aperture 36 formed in the bottom wall 32 of the support frame 16 via the reflected backlight transmission means 26. In this way, an electrostatic latent image corresponding to the original is formed 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, the irradiation device 12 and the support frame 16 to which the irradiation device 12 is mounted will be described with reference to FIGS. 2 and 3 as well as FIG. 1. The illustrated support frame 16 has front walls 38 and It has a rear wall 40, and the front wall 38 and the rear wall 40 are fixed to the front and rear ends of the upper surface of the bottom wall 32. Each of the front wall 38 and the rear wall 40 includes
Oval-shaped hole 42 on one end side (left side in Figure 3)
is formed, an elongated rectangular hole 44 is formed at the other end (right side in FIG. 3), and a substantially rectangular notch 46 is formed at the lower center. This front wall 3
8 and one end of the rear wall 40 are bent inward,
Screw holes 48 are formed in the bent portions 38a and 40a. In addition, a recess 50 is defined in the center of the bottom wall 32 over substantially the entire width thereof, corresponding to the notch 46 in the front wall 38 and the rear wall 40. The support frame 16 includes a charging corona discharger 28.
and a light transmitting means 26 are bonded as shown in FIGS. 1 and 2. That is, the charging corona discharger 28 is mounted as required by inserting one end thereof through the 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 installed as desired by positioning its ends within holes 44 in front wall 38 and rear wall 40.

On the other hand, the reflecting means 20 of the irradiation device 12 has an upper reflector 22 disposed above the irradiation lamp 18 and a lower reflector 24 disposed below the irradiation lamp 18. A lower reflector 24 is fixed between the front wall 38 and the rear wall 40. The inner surface of the upper reflector 22 defines a substantially parabolic reflecting surface, with one 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, and one end side is the first
It extends to the left in the figure, and the other end side extends to the upper right in FIG. 1 to the inside of the upper end of the light transmission means 26. 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, one end thereof extends downward from the outer surface of the light transmission means 26, and the other end extends upward from the upper outer side of the light transmission means 26. This auxiliary reflecting plate 52 is also fixed between the front wall 38 and the rear wall 40. As described above, as can be easily understood from FIG. 1, on one side of the support frame 16 (the left side in FIG. 1), one side end of the upper reflector 22 and the lower reflector 24 A ventilation opening 54 is defined by one end (see also FIG. 2), and on the upper surface of the support frame 16, the other end of the upper reflector 22 and the other end of the auxiliary reflector 52 are defined. 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 58a 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 connects the downwardly extending hanging piece to the upper reflector plate 2.
It can also be configured by fixing it to both ends of 2. As shown in FIG. 1, the bent portions 58a and 58b are located inside the bent portion 38a of the front wall 38 and the bent portion 40a of the rear wall 40 with a slight distance therebetween. A support terminal mechanism 60a for supporting one end side of the irradiation lamp 18 is attached to the bent portion 38a of the front wall 38 located outside the bent portion 58a, and a support terminal mechanism 60a for supporting one end side of the irradiation lamp 18 is attached to the bent portion 38a of the front wall 38 located outside the bent portion 58a. A support terminal mechanism 60b for supporting the other end of the irradiation lamp 18 is attached to the bent portion 40a of the wall 40. The support terminal mechanism 60a on one side includes a support terminal 62 and a support stand 64 made of synthetic resin that supports the support terminal 62. One end of the holding collar member 70 is inserted into the hole 68 formed in the support base 64, and the set screw 74 is inserted into the screw hole 48 of the bent portion 38a of the front wall 38 through the hole 72 formed in the holding collar member 70. It is attached as required by screwing it on. When mounted in this manner, the intermediate portion 62a of the support terminal 62 is supported in 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 62c is provided at the upper edge of the other end. A temperature fuse 78 and a connection terminal 80 are further attached to the support base 64. The support base 64 is provided with shoulder portions 64a and 64b, and one shoulder portion 64a is connected to the connection portion 62c of the support terminal 62 and the temperature fuse by screwing a set screw 82 to the shoulder portion 64a. 7
One terminal 78a of the
The other terminal 78b of the temperature fuse 78 and one end of the connecting terminal 80 are connected by screwing into the terminal 78b. As shown in FIG. 1, the temperature fuse 78 is located on the upper surface of the middle part of the upper reflector 22, detects the temperature near the irradiation lamp 18, and is cut off when the temperature exceeds a predetermined value to stop the current flowing to the irradiation lamp 18. cut off the supply of In addition, the support terminal mechanism 60 on the other side
b also includes a support terminal 86 and a support base 88 made of synthetic resin that supports the support terminal 86;
Insert one end of the retaining collar member 94 into the hole 90 formed in the support base 88 and the hole 92 formed in the support base 88,
The retaining collar member 94 is installed as desired by passing a set screw 98 through a hole 96 formed in the retaining collar member 94 and screwing it into the threaded hole 48 of the bent portion 40a of the rear wall 40. When mounted in this manner, the intermediate portion 86a of the support terminal 86 is supported within the recess 100 of the support base 88, and one end portion 86b thereof is located behind the rear wall 40. One end of the support terminal 86 is bent inward, and the other end 86c is bent in a direction away from the support base 88 (lower left in FIG. 3) to form a connecting portion. The other end of the connection terminal 80 and the other end 86c of the support terminal 86 described above are, respectively,
It is connected to the power supply (not shown) of the electrostatic copying machine.

The irradiation lamp 18 is supported between the support terminal 62 of the support terminal mechanism 60a and the support terminal 86 of the support terminal mechanism 60b. That is, one end of the irradiation lamp 18 passes through the hole 42 in the front wall 38 and is supported by a bent portion provided at one end 62b of the support terminal 62, and the other end passes through the hole 42 in the rear wall 40 and is supported by the support terminal 8.
6 is supported by a bent portion provided at one end 86b.

In the irradiation device 12 described above, as can be understood from FIGS. 1 and 2, the bent portions 58a and 5
8b is configured to close the ventilation opening 54,
The width of the bent portions 58a and 58b is preferably narrower, and 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,
The width of the bent portion 58a is longer than the width of the bent portion 58b (see FIGS. 2 and 3). sea bream). In connection with this, a black characteristic region 102 (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 58a 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 58a corresponding to the bent portion 58b (that is, an outer portion of the inner surface of the bent portion 58a having a width substantially equal to the width of the bent portion 58b) ) is substantially the same as the inner surface of the bent portion 58b, but the entire remaining inner surface is a black characteristic region 102. With this configuration, the reflectances of one end side and the other end side of the upper reflector plate 22 are substantially equal,
The original can be exposed substantially uniformly. This black characteristic area is formed, for example, by applying black paint or 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. This black characteristic region 10
4 extends over substantially the entire width at the other end of the lower reflector plate 24 and prevents specular reflection from the irradiated portion from being guided to the light transmitting means 26 .

In the irradiated portion 12 configured as described above, the heat from the irradiation lamp 18 is transferred to the bent portion 58 of the upper reflector 22.
a and 58b, and the support terminal mechanism 6
The 0a and 60b supports 64 and 88 are not directly exposed to the heat from the irradiation lamp 18, and thermal deterioration of the supports 64 and 88 can be prevented.
Furthermore, the bent portion 58a of the upper reflector 22 and the support base 64
There is a small gap between the bent portion 38a of the front wall 38 to which the support plate 88 is attached, and 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. Because of this presence, thermal deterioration of the supports 64 and 88 can be more effectively prevented.

Although specific examples of the irradiation device configured 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. It is.

For example, in the illustrated example, the upper reflector 2
A black characteristic region 10 is formed on a part of the inner surface of the bent portion 58a of No. 2.
2, but if desired, instead of
A black characteristic region may be provided over the entire inner surface of the bent portions 58a and 58b.

In addition, in the illustrated example, the upper reflector 22
Although the bent portions 58a and 58b are provided at one side end, instead of this, bent portions extending toward the upper reflecting plate 22 may be provided at both ends of the one side end of the lower reflecting plate 24. . In such a case, the lower reflector 24 constitutes a first reflector, and the upper reflector 22 constitutes a second reflector.

According to the present invention, the following effects are achieved.

(1) Since the support base is installed outside the bent part formed as a heat-resistant protection means at both ends of one side of the first reflective member, the support base is directly exposed to the heat from the irradiation lamp. It is not exposed to heat and can prevent adverse effects of heat on the support base, that is, thermal deterioration. As a result, when the support base is made of synthetic resin, its lifespan can be extended compared to conventional support bases that are exposed to heat.

(2) The heat-resistant protection means is constructed by forming a bent portion in the first reflective member. That is, the heat-resistant protection means can be obtained by using existing members without adding a special heat shielding member. As a result, the structure is extremely simple and can be put into practical use at low cost, making it extremely useful in practice.

(3) Since the black characteristic region is provided on the inner surface of at least one of the bent portions, the effect of (1) above can be achieved without impairing the reflective function of the reflector means.

That is, when the areas of both bent portions are different, by providing a black characteristic region in a necessary portion of the inner surface, it is possible to easily make the reflectances of the inner surfaces of both bent portions substantially equal. As a result, the original can be exposed uniformly, and so-called uneven exposure can be prevented. In addition to making the reflectance of the inner surfaces of both bent portions equal, the reflective area can be freely adjusted within a predetermined range.

(4) Between each support base and the corresponding bending part,
When a gap is provided between each, the heat shielding effect is further improved.

(5) If 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 reflective region on the same inner surface is properly is adjusted to As a result, problems such as the bright spot of the irradiation lamp being reflected and adversely affecting the image are prevented, and proper exposure can be performed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a portion of an electrostatic copying machine equipped with an irradiation device constructed according to the present invention. 2 is a perspective view showing a support frame and an irradiation device in the electrostatic copying machine of FIG. 1; FIG. 3 is an exploded perspective view showing the support frame and irradiation device of FIG. 2; FIG. 2...Copy machine housing, 4...Rotating drum,
8...Transparent plate for document placement, 12...Irradiation device, 1
4... Optical device, 16... Support frame, 18... Irradiation lamp, 20... Reflection means, 22... Upper reflecting plate, 24... Lower reflecting plate, 54... Ventilation opening, 5
8a and 58b...bending portion, 60a and 60b...
...Support terminal mechanism, 62 and 86...Support terminal, 6
4 and 88... support stand, 102 and 104... black characteristic area.

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 comprising: It includes a first reflective member and a second reflective member that are spaced apart from each other, and the first reflective member and the second reflective member define a ventilation opening at one end side. In an irradiation device for a copying machine that is attached to a support frame, the support terminal mechanism includes support terminals that are attached to the support frame so as to be located at both ends of the irradiation lamp, and that each support the irradiation lamp; a support base that supports the terminal, and at both ends of the first reflecting member on the one side end side,
Heat-resistant protection means extending toward the second reflective member are provided, and each of the heat-resistant protection means bends both ends of the one side end of the first reflective member toward the second reflective member. the support base is disposed on the outside of each of the bent portions, and the inner surface of at least one of the bent portions is coated with a black color. An irradiation device in a copying machine in which a region is provided. 2 The width of one of the bent portions is longer than the width of the other bent portion, and the portion of the inner surface of one of the bent portions other than the portion corresponding to the other bent portion is non-conforming. 3. The irradiation device for a copying machine according to claim 2, wherein the irradiation device is a black characteristic region. 3. The irradiation device for a copying machine according to claim 1 or 2, wherein a gap is provided between each of the support stands and the corresponding bending portion. 4. Claims 1 to 3, 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 in the copying machine according to any one of the above. 5. 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. Claim 4 is a lower reflector disposed below, and the black characteristic region is provided at the other end of the inner surface of the lower reflector.
An irradiation device for the copying machine described in Section 1.