JP2550122B2 - Original illumination device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a document illuminating device, and more particularly to a document illuminating device applicable to a full exposure type copying machine.

(Prior Art) Generally, in an image forming apparatus such as a copying machine, a top surface of a housing is made of contact glass, and a light source for illuminating a document placed on the contact glass is arranged in the housing. An original illuminating device is known.

In the above, an air blowing means such as a cooling blower is used in order to prevent the heat of the light source as the whole surface exposing means from becoming high.

Conventionally, there is a case where the connector for inputting drive power to the blower is forgotten in a disconnected state at the time of maintenance.

In particular, the effect of the blowing means is related to the long-term lamp life, so that it is difficult to find it immediately after maintenance, which leads to a problem associated with high lamp heating. In particular, when a flash lamp is used as a light source, the rise in temperature inside the tube leads to defective light emission, and electrode wear also becomes significant, which has a large effect.

(Object) Accordingly, it is an object of the present invention to provide a document illuminating device capable of preventing forgetting to connect the blower input connector during maintenance.

(Structure) In order to achieve the above-mentioned object, the present invention has an upper surface of a casing made of contact glass, and a light source for illuminating a document placed on the contact glass is arranged in the casing. In the original illuminating device, a removable cover that shields one side of the original illuminating device, a cover detecting unit that detects the presence or absence of the cover, a blower unit fixed to the cover, and a blower unit are provided. Drive power input,
And input connector means for inputting / outputting to / from the cover detecting means, output means for supplying electric power from the main body side to the blower means, and the cover detecting means, and the input connector means and the output connector. It is characterized in that power is supplied to the cover detecting means when the means is connected.

 Hereinafter, specific description will be given based on examples of the present invention.

First, a basic mode of cooling the light source will be described with reference to FIGS. 8 to 10.

In FIG. 8, reference numeral 100 indicates a flash lamp composed of an arcuate curved tube, which is fixed in a groove 200A formed in an ear portion protruding from the block 200.

Further, assuming that the center of curvature of the flash lamp 100 is a point 0, five grooves 200A-1, 200A-2, 20 are radially formed from this point 0.
0A-3, 200A-4, 200A-5 communicates with the outlet 400 of the cooling blower 300.

Among these grooves, especially the grooves located at both ends 200A-1,200A
-5 is formed corresponding to the electrode P of the flash lamp 100 and has a larger cross-sectional area than the other grooves.

Further, a reflecting mirror 500 as shown in FIG. 9 is provided on the back of the flash lamp 100, that is, on the back side in the direction of penetrating the paper surface, and the original on the contact glass located on the front side in the direction of penetrating the paper surface. It is designed to irradiate reflected light toward.

Here, the fan 300 and the groove-forming block 200 constitute a blowing means, and cooling air is sent to the flash lamp 100 to exert a cooling effect.

In particular, since the lamp electrode P has a large amount of heat generation, it is sufficiently cooled by the grooves 200A-1, 200A-5 having a large air flow rate.

Next, a more specific example will be described with reference to FIGS. 1 to 7.

First, the cross section of the illumination device of the copying machine will be described with reference to FIG.

The light flux emitted from the flash lamp 1 is reflected by the reflecting mirror 2 and illuminates the original 4 on the contact glass 3.

The illuminated original image is projected onto a photoconductor (not shown) by an image forming means (not shown) including a lens.

In the vicinity of the flash lamp 1, a reflection shade 5 having a reflection surface for returning the irradiation light from the flash lamp 1 to the flash lamp 1 in the direction corresponding to the reflecting mirror 2 is installed,
Further, a light shielding plate 6 is provided to prevent direct light from the flash lamp 1 from reaching the document.

The contact glass 3 is fixed to the upper base 8 of the illumination system by a scale 7 indicating the setting reference of the original 4 and a glass retainer (not shown).

Further, the upper base 8 is provided with an auxiliary reflection plate 9. The auxiliary reflectors are also provided in the front-rear direction penetrating the paper surface and are configured so as to surround from three directions in the end, and the light reflected from the reflecting mirror 2 and directed to other than the document surface is reflected toward the document surface. It works to increase the illuminance.

The reflector 2 is fixed to the lower base 10 of the illumination system.
A lamp stand 11 is fixed to the lower base 10, and a lamp holder 12 that holds the flash lamp 1 is adjustablely held on the lamp stand 11.

A removable inner cover 13 that shields one side of the document illuminating device is attached to the openings of the upper base 8 and the lower base on the side of the light source 1 to protect the light source unit.

A duct 14 is installed on the inner cover 13, and when the inner cover is set, the ventilation part 15 of the lamp holder 12 and the duct 14
The light source cooling air passages are formed so that their ends match. This light source cooling blast path is composed of the blast section 15 of the lamp holder 12, the lamp cover 16, the duct 14 and the like, and the air blown through these is blown toward the light source 1. Further, the gaps between the front and rear side plates (not shown), the stay 17, the wall plate 18 and the like are closed by packings 19 and 20, while the image forming means (the lower right side) is also covered by a seal or the like to infiltrate dust from other places. Is being prevented.

In the figure, the arrow indicates the path of the cooling air, which is blown to the flash lamp 1 through the duct 14 and the blower unit 15. Here, the blower unit 15 is the groove 200A-1 shown in FIG.
It is formed according to -5.

Next, the cooling air blowing passage will be described with reference to FIG.

The flash lamp 1 is a flash lamp that is an arc-shaped curved tube centered on a point 21 and has a trigger wire 22 on the outside.
It is fixed by 22A.

Clamper 23,2 with the contact part of the lamp end covered with insulation
It is fixed to the lamp holder 12 via the terminal blocks 25 and 26.

The lamp holder 12 is formed with an opening 27 for receiving the wind from the duct 14 and grooves 28 to 32 as air passages to the lamp.

Further, the groove portion 2 which constitutes the air passage to the lamp electrodes 33, 34
8 and 32 are wider than the other groove portions 15, 29 and 31, so that the air volume becomes larger.

In addition, although the number of grooves is five in this example, it is possible to increase the number of grooves, and it is preferable that the number of grooves is more uniform.

A reflecting mirror 2 is installed below the flash lamp 1, and a reflecting surface having a curved surface with a point 21 as the center of rotation is formed corresponding to the flash lamp 1. Also, the reflecting mirror 2
Side reflectors 35 and 36 are vertically installed in a portion radially cut from a point 21 which is the end of the.

The inner cover 13 is recessed at a position corresponding to the end of the lamp.
37 and 38 are provided, and insulating sheets 39 and 40 are attached inside the recesses.

As a result, even if an abnormal load is applied to the inner cover 13, or if the coating of the lamp wire is lost due to some accident, an accident such as a leak can be prevented.

Further, the cooling blower 41 is fixed to the inner cover 13, and the outlet of the cooling blower 41 is a seal member (not shown).
Is connected to the duct 14 via.

The cooling air is blown radially toward the flash lamp 1 through the filter 42 by the cooling blower 41, the opening 14 of the duct 14 and the lamp holder 12, and the grooves 28-32.

Next, the lower base will be described with reference to FIG.

A lamp stand 11 is fixed on the lower base 10. The lamp holder 12 is fixed to the lamp stand 11 via spacers 43 and 44. Since the fixing portion of the lamp holder 12 is a long hole, the flash lamp 1, the reflection shade 5 (see FIG. 3), the light shielding plate 6 and the like can be moved in the direction of an arrow 45 as a whole. Further, by selecting the thickness of the spacers 43, 44, the entire lamp holder 12 can be moved up and down.

In this way, the illuminance distribution can be changed by changing the lamp position vertically and horizontally (in the direction of arrow 45), and adjustment can be performed after the lamp is replaced.

A recess 46 for the duct 14 is provided in the lamp stand 11, a seal 47 is provided inside the recess as a sealing means for the duct 14, and an upper part of the lamp stand 11 between the lamp holder 12 and the lamp holder 12. Each seal 48 is provided to prevent the cooling air from leaking.

Wires 49, 50, 51 from flash lamp 1 are wire holders
52, and is connected to the output of a trigger unit 53 and a flash power supply (not shown).

A cover switch 54 as a cover detecting means for detecting the presence or absence of the inner cover 13 is fixed to the lower base 10, and an actuator 55 of the switch is projected to a mounting portion of the inner cover 13, and the actuator 55 is pressed by the mounting of the inner cover 13. It is turned on and the presence or absence of the inner cover can be detected. Also, an output connector 56 to the inner cover 13 is attached nearby.

Next, the connecting portion of the lamp electric wire will be described with reference to FIG.

Among the electric wires from the light source 1, the electric wires 49 from the trigger wire and the electric wires 50, 51 from the electrodes are attached with plugs 57, 58, 59, respectively, and by the plug holder 60 and the plug cover 61,
It is held with an appropriate degree of freedom through the insulating elastic body 62.

On the other hand, the output socket 63 from the trigger unit 53 (see FIG. 1) and the output sockets 64 and 65 from the flash power source (not shown) are mounted on the bracket 66 at different pitches (l =
It is fixed by l ').

Wire holder with plug holder 60 and plug cover 61
Since the 52 also holds the plugs at the same pitch, it will not be set even if it is inserted in the opposite direction, and erroneous connection will be prevented.

The electric wire holder 52 is fixedly set on the bracket 66. At this time, since the plug holder 60 and the plug cover 61 are fixed, the elastic body 62 is in a compressed state, and the plugs 57, 5
8 and 59 are pressed against sockets 63, 64 and 65, respectively.

As described above, by setting the plugs 57, 58, 59 via the elastic body 62, it is possible to prevent loosening during transportation or local setting failure during setting. Note that reference numeral 90
Indicates a contact portion between the plug-sum electric wire and the socket-side electric wire.

Since the current is large in a flash lamp, a slight contact failure causes a serious accident such as terminal burnout or terminal welding due to sparks, so contacting the plug through an insulating elastic body has a great effect.

Next, the inner cover portion will be described with reference to FIG.

The inner cover 13 has a cooling blower as a blower.
41 is fixed, and the duct 14 is connected to the outlet of the cooling blower 41 via a seal member (not shown).

The suction port of the cooling blower 41 is opened and the filter 42 is
The cooling air is blown out through the suction duct 14 (see FIG. 2).

Further, a seal 67 is attached to seal the connecting portion from the duct 14 to the lamp holder 12. On the other hand, a cooling fan 68 as a blowing means for exhausting air is fixed to the inner cover 13 so that the air inside the machine is blown out of the machine.

The cooling blower 41 and the cooling fan 68 are electrically connected in parallel, and are integrated in the input connector 69.

Therefore, the inner cover 13 can be removed by removing the input connector 69 and a few screws.
Since the cooling blower 41, the duct 14, and the cooling fan 68 are fixed to the inner cover 13, the sixth cover is removed when the inner cover 13 is removed.
As shown in the figure, the lamp stand 11 is in an open state, and the maintenance of the lamp holder 12 part, the connector part and the like becomes very easy.

Further, when the air blow and the exhaust air are individually connected, insufficient cooling or contamination due to intake air from the inside of the machine may be a problem due to connection mistakes, etc. The airtightness with other units can be maintained.

Next, the connection of the inner cover portion will be described with reference to FIG.

The cooling fan 68 and the cooling blower 41 are connected in parallel as described above and connected to the input connector 69, and the other terminals 70 and 71 of the input connector are connected in a loop.

Two from the main connector 72 are for input to the cooling fan 68 and the cooling blower 41, and the other one is for the terminal 70 of the input connector 69.
Corresponding to the terminal 73 of the output connector 56, the remaining one to the COM terminal 74 of the cover switch 54, the NO of the cover switch 54.
(Normally open) Terminal 75 is terminal 71 of input connector 69
Are respectively connected to the terminals 76 of the output connector 59 corresponding to.

That is, the input to the cover switch 54 is the input connector 69.
Since the input connector 69 is detached or the cover switch 54 is off, the input / output lines 77 and 78 to the cover switch 54 are disconnected.
Therefore, it is possible to ensure low cost, ease of maintenance management, and safety by performing two detections of a defective cover set and the absence of a cover as well as a non-connection of a cooling blower or the like by the cover detection signal.

Next, an electric circuit of a blower system of the document illuminating apparatus according to this example will be described with reference to FIG.

The connection relationship between the input connector 69 and the output connector 56 is collectively indicated by the contact 79. The inner cover 13 is attached to the lower base 10 and the like by connecting both the above-mentioned connectors, and at the same time, the actuator of the cover switch 54 is pressed by the inner cover 13 to turn on the cover switch 54.

As a result, the base voltage 81 of the transistor 80 becomes 0V and the light emitting diode 82 does not operate.

On the other hand, when the input connector 69 and the output connector 56 are not in contact with each other, the contact 79 is turned off, or when the cover switch 54 is turned off, the base voltage 81 becomes High and the light emitting diode.
82 is fired.

Here, the light emitting diode 82 is a display lamp for displaying a warning of "opening of inner cover" or "non-connection of cooling blower", and is installed on a portion that is easy for the operator to see, such as an operation panel, as a display to call attention of the operator. Alternatively, this signal can be input to a CPU or the like to display characters on the display, or can be used as a prohibition signal for instructing an input off to the flash power source.

As described above, cooling is particularly important in flash lamps, and by using a signal from a door switch or the like, it is possible to easily and effectively prevent misconnection or forgetting of connection of a connector to a cooling fan or the like. At the same time, it is possible to prevent accidents when the cover is set incorrectly and the power is turned on without the cover.
Serviceability and safety can be improved with a simple configuration.

(Effect) According to the present invention, it is possible to effectively prevent forgetting to connect the blower input connector during maintenance, which is advantageous.

[Brief description of drawings]

FIG. 1 is a perspective view of the original illuminating device with the inner cover removed, FIG. 2 is a cross-sectional view of the original illuminating device, FIG. 3 is a vertical sectional view of the original illuminating device, and FIG. FIG. 5 is a perspective view of the inner cover portion, FIG. 6 is a wiring diagram of the inner cover portion, FIG. 7 is an electric circuit diagram of a cooling fan and the like, and FIG. 8 shows a basic configuration of the present invention. FIG. 9 is a perspective view of a reflecting mirror, and FIG. 10 is a perspective view of a block diagram having radial grooves. 13 …… Inner cover, 41 …… Cooling blower, 54 …… Cover switch, 56 …… Output connector, 68 …… Cooling fan,
69 …… Input connector.

Claims (1)

(57) [Claims] 1. A manuscript illuminating device comprising an upper surface of a casing made of contact glass, and a light source for illuminating a manuscript placed on the contact glass arranged in the casing. A removable cover that shields one side of the lighting device,
A cover detecting means for detecting the presence or absence of the cover, an air blowing means fixed to the cover, an input connector means for inputting drive power to the air blowing means, and an input / output to the cover detecting means, and a main body. From the side, and output connector means for supplying electric power to the cover detecting means, and when the input connector means and the output connector means are connected, electric power is supplied to the cover detecting means. A document illuminating device characterized by being configured as described above.