JP3317065B2 - Lamp unit for document reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp unit for irradiating a document used in a document reading apparatus for reading image information of a document. In particular, the present invention relates to an improvement in a structure for holding an end of the cylindrical lamp.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a general document reading apparatus.

In FIG. 1, reference numeral 1 denotes a main body, and 2 denotes a lid attached to the main body 1 so as to be opened and closed by a shaft 2a.

The main body 1 has a case 3 and a reading unit 4 housed in the case 3.

An opening 3a is formed in the upper surface of the case 3, and the upper surface 5a of the glass plate 5 attached so as to close the opening 3a from the inside constitutes a document setting surface for setting the document S. are doing.

[0006] The reading unit 4 includes a frame 4a,
The frame 4a includes a lamp unit 6 for irradiating a document, a reflecting mirror 7, an optical lens 8, and an image sensor (CCD) 9.

The lamp unit 6 includes a cylindrical lamp 10.
R, 10G, and 10B. The lamp 10R emits red light toward the original S, the lamp 10R emits green light,
10B emits blue light.

The reading unit 4 has its frame 4a
Are supported by guide means such as guide shafts and guide rails (not shown), and are driven in the direction of arrow X by drive means (not shown).

When reading the original S, the lid 2 is opened,
The original S is set on the original setting surface 5a of the main body 1, and the cover 2 is closed.

Thereafter, when a document reading switch (not shown) is turned on, the lamps 10R, 1R of the reading unit 4
The reading unit 4 starts running in the direction of the arrow X at the same time that the scanning unit 0G and 10B start irradiating the document S.

As described above, while the reading unit 4 is running, the light emitted from the lamps 10R, 10G and 10B and reflected by the original S is read by the image sensor 9 via the reflecting mirror 7 and the optical lens 8. .

For example, the mounting structure of the lamp of the lamp unit 6 in the above-described document reading apparatus is conventionally known.
The structure was as shown in FIG.

In FIG. 1, reference numerals 6a denote lamps 10R and 10R.
A set groove 6b into which the ends of the lamps are inserted, and a drawing groove 6c through which the electric wire 12 connected to the lead wire 11 of the lamp is drawn out of the holder. Is formed.

In order to fix the lamp to the holder 6a, a lamp in which an electric wire 12 is connected to a lead wire 11 of the lamp by soldering 12a or the like is prepared in advance. And first,
The ends of the lamps 10R, 10G, 10B are respectively inserted into the set grooves 6b, and then the positions of the lamps 10R, 10G, 10B around the axis are adjusted.
Pull out along the side of the holder 6a along the line c. Thereafter, a resin such as a silicone resin is filled in a gap between the set groove 6b and the lamp and a gap between the lead groove 6c and the electric wire 12, and after mounting a cover (not shown) from above, the resin is left for a predetermined time to solidify the resin. Waiting had been fixed.

[0015]

Problems to be Solved by the Invention Lamps 10R, 10
G and 10B are structurally the same, and FIG.
(B) and as shown in FIG. 11, a transparent glass tube 13 sealed at both ends, and the glass tube 13
A phosphor layer 14 formed over substantially the entire inner surface of
Electrodes 15 and 15 disposed at both end portions,
The lead wire 11 connected to the electrode 15 is drawn out from the end of the glass tube 13 in the axial direction. The glass tube 13 is filled with xenon gas. The outer diameter of the glass tube 13 is 4.8 m
m.

The phosphor layer 14 is formed in a C-shaped cross section as clearly shown in FIG. 10B, and as a result, as shown in FIG. An elongated slit-shaped irradiation window 16 is formed. FIG.
As shown in (b), the opening angle θ of the irradiation window 16 as viewed from the center of the glass tube 13 is set to about 60 °.

A linear auxiliary electrode 17 is formed on the outer peripheral surface of the glass tube 13 at a position facing the irradiation window 16 with the axis thereof interposed therebetween. One end of the auxiliary electrode 17 is shown in FIG. As described above, the lead wire 18 similar to the lead wire 11 is connected by soldering 18a. The auxiliary electrode 17 is not provided on the lamp 10R that emits red light.

In the lamp as described above, when a voltage is applied to the electrodes 15, 15, as shown in FIG.
A positive column A is formed between the layers 15, which generates ultraviolet rays by the action of xenon gas, and the ultraviolet rays become visible light by the action of the phosphor layer 14 and are emitted from the irradiation window 16. In the lamp having the auxiliary electrode 17, the positive column A is formed at a position deviated toward the auxiliary electrode 17 as shown in FIGS.

Since the opening angle θ of the irradiation window 16 is set to about 60 ° as described above, the directivity of the irradiation light becomes sharp as shown in FIG.

Therefore, it is desired that the position accuracy around the axis of the lamp that emits such sharply directional irradiation light be high.

When the positional accuracy of the lamp is reduced, the amount of light emitted to the position to be read of the original S is reduced due to the sharp directivity of the irradiated light, and therefore the amount of reflected light from the original S is also reduced. 9 also reduces the amount of light received per unit time. For this reason, if the output value from the image sensor is made to be equal to or more than a predetermined value in order to ensure image quality, the accumulation time of light reception in the image sensor (the period for storing the amount of light) must be set long. This is because the reading speed decreases.

FIG. 13 is a graph for making this situation easier to understand. The vertical axis represents the output from the image sensor, and the horizontal axis represents the light receiving accumulation time in the image sensor.

Since the image quality obtained by the image sensor is determined by the S / N ratio, it is desired that the output value from the image sensor be as large and as constant as possible S1. In such a situation, if the amount of light received per unit time decreases for the above-described reason, the accumulation time must be set long, that is, the traveling speed of the reading unit 4 must be reduced. Absent.

Under the circumstances described above, even in the conventional lamp unit 6, in order to improve the positional accuracy around the axis of the lamp, as described above, the setting groove 6 of the holder 6a is used.
b, the gap between the lamp and the lead groove 6c and the electric wire 12
The gap between the lamp and the holder is filled with a resin, and the resin is solidified to firmly fix the lamp and the holder.

However, the conventional lamp unit 6
As shown in FIG. 9, the structure is such that the electric wire 12 connected to the lead wire 11 is drawn out to the side of the holder 6a along the drawing groove 6c. In addition, the lamp may move due to the restoring force based on the elasticity of the lead wire 11 and the electric wire 12, and the positional accuracy around the axis of the lamp may not be secured.

When the electric wire 12 is pulled out, the lead wire 11 and the electric wire 12 are bent or twisted, so that a restoring force acts. Performing the alignment itself was a difficult task.

Further, in the lamp having the auxiliary electrode 17, the lead wire 18 is connected to the auxiliary electrode 17 by soldering 18a, and the electric wire 12 is connected to the lead wire 18 by soldering or the like. In addition, since the electric wires are also drawn out in the same manner, the above-described alignment work is more difficult, and the solder positioned on the outer peripheral surface of the lamp when the lamp is rotated for alignment. At the portion of the attachment 18a, there is also a disadvantage that the lead wire 18 is easily detached and conduction cannot be obtained.

The first object of the present invention is to solve the above-described problems. The first object of the present invention is to secure the positional accuracy around the axis of the lamp and to easily perform the alignment work. To provide a lamp unit for a document reading device.

A second object of the present invention is to provide a lamp unit for an original reading apparatus which can ensure conduction to the auxiliary electrode in a lamp having the auxiliary electrode.

[0030]

According to a first aspect of the present invention, there is provided a lamp unit for a document reading apparatus, which has a slit-shaped irradiation window extending in an axial direction, and extends in an axial direction from an end. A cylindrical lamp having a lead wire and an inner diameter slightly smaller than the outer diameter of the end of the lamp.
And rotate the lamp around its axis in contact with the end of the lamp.
Temporary fixing portion for holding rotatably lighter and, an external connection portion to be electrically connected to the lead wire connecting portion and the outside of the unit to be connected to the lead wire located axially extending portion of the lamp which is held by the temporary fixing portions have a connection bracket having a,
Glue the end of the lamp after the position adjustment around the axis
And a holder fixed with an agent .

According to a second aspect of the present invention, in the lamp unit for the original reading apparatus according to the first aspect of the present invention, the position of the lamp is adjusted so that the irradiation window faces a predetermined direction in the temporary fixing portion. A mark for alignment is formed.

According to a second aspect of the present invention, there is provided a lamp unit for a document reading apparatus according to the first or second aspect of the present invention, wherein the lamp sandwiches the axis of the lamp unit. In the holder, an auxiliary electrode is provided on the outer peripheral surface facing the irradiation window, and an auxiliary electrode connection fitting including a press-contact portion pressed against the auxiliary electrode and an external connection portion electrically connected to the outside of the unit is provided on the holder. It is characterized by having been done.

According to a fourth aspect of the present invention, there is provided the lamp unit for the original reading device according to the third aspect, wherein the auxiliary electrode has a portion which is in pressure contact with the auxiliary electrode connecting member than other portions. It is characterized by being formed thick.

According to a fifth aspect of the present invention, there is provided a lamp unit for a document reading apparatus for achieving the first object.
A cylindrical lamp having a lead wire extending in the axial direction from the end, and having a sharp directivity of irradiation light around the axis, and an inner diameter slightly smaller than the outer diameter of the end of the lamp.
A temporary fixing portion which abuts on the end portion to lightly hold the lamp so as to be rotatable around its axis, and a lead which is connected to the lead wire at an axial extension of the lamp held by the temporary fixing portion; possess a fitting comprising an external connection portion to be electrically connected to the line connection and the outside of the unit, about the axis of the position
After the adjustment is made, the end of the lamp is fixed with adhesive.
And a holder which is provided.

[0035]

According to the first aspect of the invention, when the end of the lamp is set on the temporary fixing portion of the holder, the end of the lamp comes into contact with the temporary fixing portion and is lightly held. The end of the lamp is slightly smaller than its outside diameter.
Since the lamp is only lightly held rotatably around the axis by the temporary fixing portion having a diameter , the lamp can be easily rotated around the axis by pinching the lamp with a finger or the like. Therefore, the position adjustment around the axis can be easily performed.

The holder has a connection fitting. The connection fitting is located at an axial extension of the lamp held by the temporary fixing portion and is connected to the lead wire. And an external connection portion that is electrically connected to the external connection portion. By connecting the lead wire of the lamp held by the temporary fixing portion to the lead wire connection portion, electrical connection to the outside via the connection fitting becomes possible.

According to such a lamp unit for a document reading apparatus, the end of the lamp is set on the temporary fixing portion of the holder, the position around the axis is adjusted, and the lead wire is connected to the lead wire connecting portion. By attaching an adhesive between the end of the lamp and the holder, the lamp and the holder can be fixed.

Even when a resin similar to the conventional resin is used as the adhesive, the lead wire of the lamp is in a state of being connected to the lead wire connecting portion located at the axial extension of the lamp. The bending and twisting forces that occur in the prior art hardly act on the lead wire.

Accordingly, the lamp does not move due to the restoring force based on the elasticity of the lead wire between the time when the resin is filled and the time when the resin is solidified, and the positional accuracy around the axis of the lamp is secured with high accuracy. It will be.

That is, according to the lamp unit for an original reading device of the present invention, the positional accuracy around the axis of the lamp can be ensured, and the positioning operation can be easily performed.

According to the lamp unit for an original reading device according to the second aspect, in the lamp unit for the original reading device according to the first aspect, the temporary fixing portion is provided with a lamp such that the irradiation window faces in a predetermined direction. Since the mark for adjusting the position is formed, the position can be adjusted more easily.

That is, since the temporary fixing portion is a portion that comes into contact with the end of the lamp as described above, the positioning can be performed more easily by forming the mark in this portion.

According to the lamp unit for an original reading apparatus of the third aspect, in the lamp unit for an original reading apparatus of the first or second aspect, the outer peripheral surface of the lamp opposed to the irradiation window with its axis interposed therebetween. Since the auxiliary electrode connection metal fitting is provided in the holder, the auxiliary electrode has a press-contact portion that is in pressure contact with the auxiliary electrode and an external connection portion that is electrically connected to the outside of the unit. When set, the auxiliary electrode and the press-contact portion of the auxiliary electrode connection fitting are electrically connected by press-contact,
The auxiliary electrode can be electrically connected to the outside via the auxiliary electrode fitting.

That is, according to the lamp unit for the document reading apparatus, the lead wire for the auxiliary electrode, which has been conventionally required, is not required. Therefore, when the lamp is rotated for alignment, the lead wire is not required. It is possible to prevent a situation in which the wire is disconnected and conduction cannot be obtained.

According to the lamp unit for an original reading device according to the fourth aspect, in the lamp unit for an original reading device according to the third aspect, the auxiliary electrode is configured such that a portion that is in pressure contact with the auxiliary electrode connection fitting is another portion. Since the auxiliary electrode is formed thicker, the connection between the auxiliary electrode and the press-contact portion of the auxiliary electrode connection fitting can be made more reliably.

According to the lamp unit for a document reading apparatus according to the fifth aspect, when the end of the lamp is set on the temporary fixing portion of the holder, the end of the lamp comes into contact with the temporary fixing portion and is lightly held. The end of the lamp is slightly smaller than its outer diameter
Since the lamp is merely held rotatably around the axis by the temporary fixing portion having an inner diameter , the lamp can be easily rotated around the axis by pinching the lamp with a finger or the like. . Therefore, the position adjustment around the axis can be easily performed.

The holder has a connection fitting. The connection fitting is located at an axial extension of the lamp held by the temporary fixing portion and is connected to the lead wire. And an external connection portion that is electrically connected to the external connection portion. By connecting the lead wire of the lamp held by the temporary fixing portion to the lead wire connection portion, electrical connection to the outside via the connection fitting becomes possible.

According to such a lamp unit for an original reading device, the end of the lamp is set on the temporary fixing portion of the holder, the position around the axis is adjusted, and the lead wire is connected to the lead wire connecting portion. By attaching an adhesive between the end of the lamp and the holder, the lamp and the holder can be fixed.

Even when a resin similar to the conventional resin is used as the adhesive, the lead wire of the lamp is in a state of being connected to the lead wire connecting portion located at the axial extension of the lamp. The bending and twisting forces that occur in the prior art hardly act on the lead wire.

Therefore, the lamp does not move due to the restoring force based on the elasticity of the lead wire until the resin is filled and solidified, and the positional accuracy around the axis of the lamp is secured with high accuracy. It will be.

That is, according to the lamp unit for a document reading apparatus according to the fifth aspect, the positional accuracy around the axis of the lamp can be secured, and the positioning operation can be easily performed.

[0052]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing one embodiment of a lamp unit for a document reading apparatus according to the present invention, wherein FIG.
(B) is a front view, and (c) is a right side view when FIG. (A) is a front view.

This lamp unit has a cylindrical lamp 1.
0, a synthetic resin holder 20 for holding the end of the lamp 10, and a holder cover 30.

There are three lamps 10, the lamp 10R emits red light, the lamp 10G emits green light, and the lamp 10B emits blue light. These lamps 10R, 10G, 10B
Have basically the same configuration as the lamp described as the prior art, and the description thereof is omitted. The difference between the lamp of the present embodiment and the conventional lamp lies in the structure of the auxiliary electrode, which will be described later.

FIG. 2 shows a state where the cover 30 is removed.
3A is a plan view, FIG. 3B is a sectional view taken along line bb in FIG. 3A, and FIG. 3C is a sectional view of FIG. It is -c sectional drawing.

FIGS. 3A and 3B show only the right holder 20. FIG. 3A is a plan view, and FIG.
b sectional view, (c) is a cc view in FIG.
(D) is a left side view when FIG. (A) is a front view.

As shown in FIGS. 2 and 3, the holder 20
Three temporary fixing portions 21, 22, 23 and three connection fittings 2
4 and an auxiliary electrode connection fitting 25.

As shown in FIG. 3 (c), the temporary fixing portions 21,
22 and 23 each have a slightly different shape, but both are formed in an arc shape (almost a horseshoe shape).
It is formed integrally with the base part 26 of the holder via the connecting parts 21a, 22a and 23a.

The radii (or radii of curvature) R1, R2, and R3 of the inner surfaces of the temporary fixing portions 21, 22, and 23 are set slightly smaller than the outer diameter of the lamp to be held. In addition, at the tip portions of the temporary fixing portions 21, 22, 23,
Due to the elasticity of the temporary fixing portions 21, 22, 23, the convex portions 21b, 22b, which come into contact with the outer peripheral surface 10a (see FIG. 4) of the lamp,
23b are formed. With this, the temporary fixing portion 21,
The reference numerals 22 and 23 are adapted to abut the end 10b of the lamp and to hold it lightly. In addition, the elastic force of the temporary fixing portions 21, 22, 23 is determined by the connecting portions 21a, 22.
a, 23a width (length in the vertical direction in FIG. 3C)
Can be adjusted by appropriately setting.

Marks M1, M2, M3 for adjusting the position of the lamp are formed on the side surfaces of the temporary fixing portions 21, 22, 23. Note that the mark M1 for the lamp to be held by the temporary fixing portion 21 is formed on the temporary fixing portion 22.

As shown in FIG. 2, the connection fitting 24 has a lead wire connection portion 24a connected to the lead wire 11 of the lamp.
And an external connection portion 24b that is electrically connected to the outside of the unit. The external connection portion 24b is provided in a recess 27 formed in the holder 20. The lead wire connecting portion 24a is formed in a flat plate shape, and the lamp 10 held by the temporary fixing portion is formed.
Are located in the axial extension of. External connection part 24b
Is formed in a needle shape integral with the lead wire connecting portion 24a, and is bent as shown in FIG.
4c penetrates the base portion 26 of the holder and protrudes below the base portion. The protruding portion 24c forms a connection terminal with a connector (see FIG. 7) of a wire harness described later. The connection fitting 24 can be incorporated at the same time as the external connection portion 24b is embedded in the base portion 26 when the holder 20 is formed.

As shown in FIG. 1, between the connection fitting 24 and the temporary fixing portions 21, 22, and 23, a setting groove 28 in which the end 10b of the lamp is set is formed. A partition wall 29 is formed between the set groove 28 and the recess 27. The partition wall 29 has a slit 29a for guiding the lead wire 11 when setting the lamp.
Are formed.

As shown in FIGS. 5A and 5B, the lamp 1
A linear auxiliary electrode 17 is formed on the outer peripheral surface of the 0G and 10B glass tubes 13 at a position facing the irradiation window 16 (see FIG. 4) across the axis. The end 17a of the auxiliary electrode 17 in this embodiment is formed to be slightly thicker than the other part 17b, and the thick part 17a is connected to the auxiliary electrode connection fitting as shown in FIG. 2
5. Note that the end portion 17a does not necessarily have to be formed thick.

The auxiliary electrode connection fitting 25 is made of a metal plate having a spring property.
And an external connection portion 25b that is electrically connected to the outside of the unit. The press contact portion 25a
It is arranged in a concave portion 28a formed at a position facing the thick portion 17a of the auxiliary electrode of the set lamp. Before the lamp is set as shown in FIG. It is in a floating state due to its spring property. The external connection part 25b is formed integrally with the pressure contact part 25a, and after being guided by the guide groove 26a formed in the base part 26, the needle-like part 25d is bent as shown in FIG. The tip portion 25c penetrates the base portion 26 of the holder and protrudes below the base portion. This protruding part 25
c constitutes a connection terminal with a later-described wire harness connector (see FIG. 7), similarly to the above-described distal end portion 24c of the connection fitting. When the holder 20 is molded, the auxiliary electrode connection fitting 25 is attached to the base 26 of the external connection portion 2.
The needle-like portions 25d of 5b can be embedded simultaneously so as to be embedded.

While the right holder has been described above,
The holder on the left side is symmetrical to the holder on the right side, as shown in FIG. 6, except that the metal fitting 25 for the auxiliary electrode is provided corresponding to the lamp 10G for green light. , Has the same configuration as the right holder, and a description thereof will be omitted.

Next, the steps of assembling the above-described lamp unit and the effects thereof will be described.

(I) The left and right holders 20 are arranged at predetermined positions, and the temporary fixing portions 21, 22, 23 and the set grooves 2
8, lightly push the end 10 b of the lamp from above. The temporary fixing portion 21 has a red lamp 10R.
The green lamp 10G is pushed into the temporary fixing portion 22, and the blue lamp 10B is pushed into the temporary fixing portion 23. FIG. 2 shows the state after the lamp has been pushed in.

At this time, after the lead wire 11 is guided by the slit 29a, the lead wire 11 comes into contact with or close to the upper surface of the lead wire connection portion 24a of the connection fitting 24.

Further, the end 10b of the lamp is lightly held in contact with the temporary fixing portion. The projections 21b, 22b, and 23b are formed on the temporary fixing portions 21, 22, and 23, so that the end 10b of the lamp does not float. Therefore, the lead wire 11 is securely connected to the connection fitting. 24
Is in contact with or close to the upper surface of the lead wire connecting portion 24a.

Further, the lamp 10 having the auxiliary electrode 17
When G and 10B are set in the set groove 28, the end portion 17a of the auxiliary electrode and the press-contact portion 25a of the connection fitting 25 for the auxiliary electrode are press-contacted to be electrically connected. Since the end portion 17a is formed thicker than other portions, the connection is reliably made.

(Ii) The lamps 10R, 10G, and 10B are pinched by a finger or a predetermined tool, and rotated about their axes to perform positioning. As shown in FIG. 4, the alignment of the lamp 10R is performed by setting the edge 16a of the irradiation window 16 to the mark M1 and the lamp 10G.
Is marked M2 on the edge 16a of the irradiation window 16.
In the lamp 10B, the edge 1 of the irradiation window 16 is provided.
6a is aligned with the mark M3. In addition,
For positioning, a light receiving element is arranged at a position P to be irradiated,
It is also possible to measure the amount of light received by the light receiving element while rotating the lamp, and stop the rotation of the lamp at the position where the measured value is the largest. Such a method is particularly effective when positioning a cylindrical lamp which does not have a portion suitable for positioning such as the slit-shaped irradiation window 16 but has a sharp directivity of irradiation light around the axis. It is.

Since the end portion 10b of the lamp is only lightly held by the temporary fixing portion, the lamp can be easily rotated around its axis by pinching the lamp with a finger or the like. Therefore, the above-described position adjustment around the axis can be easily performed.

Further, the temporary fixing portion is provided at the end 10b of the lamp.
Are in contact with the mark M1, M
By forming the M2 and M3, alignment can be performed more easily.

The lamp 10 having the auxiliary electrode 17
For G and 10B, the lead wire for the auxiliary electrode, which has been conventionally required, is not required. Therefore, when the lamp is rotated for positioning, the lead wire comes off and conduction cannot be obtained. That situation is prevented beforehand.
In addition, even when the lamps 10G and 10B are rotated, in order to ensure that the end portion 17a of the auxiliary electrode 17 is in contact with the auxiliary electrode connection fitting 25, the auxiliary electrode connection fitting 25 is required. May be formed in a curved shape along the lamp peripheral surface.

(Iii) The lead wire 11 of the lamp is connected to the lead wire connection portion 24a of the connection fitting 24. Lead wire 1
1 is in contact with or close to the upper surface of the lead wire connecting portion 24a, so that the connection between the lead wire 11 and the lead wire connecting portion 24a can be easily performed by soldering, spot welding, or the like. it can.

(Iv) Lamp end 10b and holder 20
The lamp 10 and the holder 20 are fixed by attaching an adhesive between them.

At this time, a resin such as silicone rubber having an insulating property is used as an adhesive, and this resin is used as the adhesive at the end 10 of the lamp.
b and the holder 20 to fill the lamp 10
When the lamp and the holder 20 are fixed, the lead wire 11 of the lamp is in a state of being connected to the lead wire connecting portion 24a located at the axial extension of the lamp. Is hardly affected by a bending force or a twisting force generated in the prior art.

Therefore, the lamp 10 does not move due to the restoring force based on the elasticity of the lead wire 11 between the time when the resin is filled and the time when the resin is solidified. Will be secured.

The cover 30 is attached to the holder 20 after fixing the lamp 10 and the holder 20 with an adhesive. When a resin such as silicon rubber having an insulating property is used as the adhesive, the resin may be filled between the end portion 10b of the lamp and the holder 20 and then attached.

As described above, according to the lamp unit for the document reading apparatus of this embodiment, the positional accuracy around the axis of the lamp 10 can be ensured, and the positioning operation can be easily performed.

In such a lamp unit, as shown in FIG. 7, the connection terminals formed by the connection fittings protruding from the lower surface of the holder 20 and the distal end portions 24c and 25 of the connection fittings for the auxiliary electrode are shown in FIG. Is connected to the connector 41 of the wire harness 40, and power is supplied to the lamp 10 via the wire harness 40.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope of the present invention.

[0084]

According to the first, second, or fifth aspect of the present invention, the positional accuracy of the lamp around the axis can be ensured, and the positioning operation can be easily performed.

Further, according to the third or fourth aspect of the present invention, it is possible to secure conduction to the auxiliary electrode in a lamp having the auxiliary electrode.

[0086]

[Brief description of the drawings]

1A and 1B are diagrams showing an embodiment of a lamp unit for a document reading apparatus according to the present invention, wherein FIG. 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a front view of FIG. FIG.

FIGS. 2A and 2B are diagrams showing a state of an end of a right holder 20 and a lamp 10 in FIG. 1 in a state where a cover 30 of the embodiment is removed, wherein FIG. 2A is a plan view and FIG. Cross-sectional view taken along line bb in FIG.
Sectional view.

FIGS. 3A and 3B are diagrams showing only the right holder 20. FIG. 3A is a plan view, FIG. 3B is a cross-sectional view taken along line bb in FIG.
Fig. 3 is a view taken along the line cc in Fig. 3A, and Fig. 3D is a left side view when Fig. 3A is a front view.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5A is an explanatory plan view of an auxiliary electrode of a lamp,
(B) is a bb cross-sectional view in (a).

FIGS. 6A and 6B are views showing the state of the end of the left holder 20 and the lamp 10 in FIG. 1 with the cover 30 removed, wherein FIG. 6A is a plan view and FIG. 6B is bb in FIG.
Sectional drawing, (c) is cc sectional drawing in figure (a).

FIG. 7 is a partial perspective view showing connection with a wire harness.

FIG. 8 is a cross-sectional view illustrating an example of a general document reading apparatus.

FIG. 9 is an explanatory diagram of a conventional technique.

10A is a perspective view of an end portion of a lamp, and FIG. 10B is a cross-sectional view taken along line bb in FIG. 10A.

FIG. 11 is a structural view of a conventional lamp.

FIG. 12 is a diagram showing directivity of irradiation light of a lamp.

FIG. 13 is a diagram showing the relationship between the output of the image sensor and the accumulation time of light reception.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lamp 10a Outer peripheral surface of lamp 10b End of lamp 11 Lead wire 16 Irradiation window 17 Auxiliary electrode 17a Thick part 20 Holder 21 to 23 Temporary fixing part M1 to M3 mark 24 Connection fitting 24a Lead wire connection part 24b External connection part 25 Auxiliary electrode connection bracket 25a Pressure contact section 25b External connection section

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 27/54 H04N 1/04 101

Claims (5)

(57) [Claims] 1. A cylindrical lamp having a slit-shaped irradiation window extending in an axial direction and a lead wire extending in an axial direction from an end, and an inner diameter slightly smaller than an outer diameter of an end of the lamp. La
The lamp can be rotated around its axis by contacting the end of the lamp
A temporary fixing portion for holding the lamp lightly, a lead wire connecting portion connected to the lead wire and located at an axial extension of the lamp held by the temporary fixing portion, and an external connecting portion electrically connected to the outside of the unit. and a connecting bracket to possess, axis-ray diffraction
After adjusting the position of the lamp, secure the end of the lamp with adhesive.
A lamp unit for a document reading device, comprising: 2. A lamp for a document reading apparatus according to claim 1, wherein a mark for adjusting a position of the lamp so that the irradiation window is oriented in a predetermined direction is formed in the temporary fixing portion. unit. 3. The lamp has an auxiliary electrode on an outer peripheral surface facing the irradiation window with an axis thereof interposed therebetween, and a pressure contact portion pressed against the auxiliary electrode and an external connection portion electrically connected to the outside of the unit. 3. The lamp unit for a document reading device according to claim 1, wherein a connection fitting for an auxiliary electrode having: 4. The lamp unit for a document reading device according to claim 3, wherein the auxiliary electrode is formed such that a portion to be pressed against the connection fitting for the auxiliary electrode is thicker than other portions. . 5. A column-shaped lamp having a lead wire extending in the axial direction from an end portion and having a sharp directivity of irradiation light around the axis, and having an inner diameter slightly smaller than the outer diameter of the end portion of the lamp. La
The lamp can be rotated around its axis by contacting the end of the lamp
A temporary fixing portion for holding the lamp lightly, a lead wire connecting portion connected to the lead wire and located at an axial extension of the lamp held by the temporary fixing portion, and an external connecting portion electrically connected to the outside of the unit. and a connecting bracket to possess, axis-ray diffraction
After adjusting the position of the lamp, secure the end of the lamp with adhesive.
A lamp unit for a document reading device, comprising: