JP3404727B2 - 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 illuminating a document used in a document reading device for reading image information of a document. In particular, it relates to an improvement in the structure for holding the end portion of the cylindrical lamp.

[0002]

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

In the figure, reference numeral 1 is a main body, and 2 is 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 on 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 an original setting surface for setting the original S. is doing.

The reading unit 4 includes a frame 4a and
The frame 4a includes a lamp unit 6 for illuminating 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
It has R, 10G, and 10B. The lamp 10R emits red light toward the document S, and 10G 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 arrow X direction by drive means (not shown).

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

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

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

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

In the figure, 6a is a lamp 10R, 10
A holder for holding the end portions of G and 10B, and a set groove 6b into which the end portion of the lamp is inserted, and a pull-out groove 6c for pulling the electric wire 12 connected to the lead wire 11 of the lamp out of the holder. Has been formed.

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

[0015]

[Problems to be Solved by the Invention] Lamps 10R, 10
G and 10B are structurally the same, and FIG.
As shown in (b) and FIG. 11, both ends of the transparent glass tube 13 are sealed, and the glass tube 13
A phosphor layer 14 formed over substantially the entire inner surface of
It has electrodes 15 and 15 arranged at both ends,
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.
It is about m.

The phosphor layer 14 is formed in a C-shaped cross section as shown in FIG. 10 (b), and as a result, the lamp layer 14 is formed in the axial direction as shown in FIG. 10 (a). An elongated slit-shaped irradiation window 16 is formed. Figure 10
As shown in (b), the opening angle θ of the irradiation window 16 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 opposed to the irradiation window 16 with the axis line therebetween, and one end of this 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 in the lamp 10R that emits red light.

In the lamp as described above, as shown in FIG. 11, when voltage is applied to the electrodes 15, 15, the electrodes 15,
A positive column A is formed between 15 and this produces ultraviolet rays by the action of the xenon gas, and the ultraviolet rays become visible light by the action of the phosphor layer 14 and are irradiated from the irradiation window 16. For the lamp having the auxiliary electrode 17, as shown in FIGS. 10B and 11, the positive column A is formed at a position deviated to the auxiliary electrode 17 side.

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

Therefore, it is desired that the positional accuracy around the axis of the lamp that emits the irradiation light having such a sharp directivity is high.

When the position accuracy of the lamp becomes low, the directivity of the irradiation light is sharp, so that the amount of light emitted to the position on the original S to be read is reduced, and thus the amount of light reflected from the original S is also reduced, and the image sensor is reduced. The amount of light received by 9 per unit time also decreases. For this reason, if the output value from the image sensor is set to a predetermined value or more in order to secure the image quality, the light receiving accumulation time (the period for accumulating the light amount) in the image sensor must be set long, and as a result, the original document This is because the reading speed becomes slow.

FIG. 13 is a graph for facilitating understanding of such a situation, in which 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 constant as S1. In such a situation, if the amount of light received per unit time is reduced due to the reason described above, the accumulation time must be set longer, that is, the traveling speed of the reading unit 4 must be slowed. Absent.

From the above circumstances, in the conventional lamp unit 6 as well, 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.
The gap between b and the lamp, and the pull-out groove 6c and the electric wire 12
It was devised to fill the gap between and with resin and solidify it to firmly fix the lamp and the holder.

However, the conventional lamp unit 6
Has a structure in which 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 as shown in FIG. 9. Therefore, until the resin is filled and this is solidified. 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.

Further, 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 is exerted, and under such a situation where the restoring force acts, the position of the lamp is increased. Matching itself was a difficult task.

Further, regarding the lamp having the auxiliary electrode 17, the lead wire 18 is also connected to the auxiliary electrode 17 by soldering 18a, and the electric wire 12 is also connected to the lead wire 18 by soldering or the like. Since this electric wire was also drawn out in the same manner, in addition to the above-mentioned alignment work being more difficult, the solder located on the outer peripheral surface of the lamp when the lamp was rotated for alignment There is also a problem that the lead wire 18 is easily detached at the attachment 18a portion and conduction is not obtained.

The present invention is intended to solve the problems as described above, and the first object thereof is to ensure the positional accuracy around the axis of the lamp and to easily perform the positioning work. Another object of the present invention is to provide a lamp unit for a document reading apparatus that can be used.

A second object of the present invention is to provide a lamp unit for a document reading device which can ensure electrical continuity to an auxiliary electrode in a lamp having an auxiliary electrode.

[0030]

In order to achieve the first object, a lamp unit for a document reading apparatus according to a first aspect of the present invention is provided with a slit-shaped irradiation window extending in the axial direction and extending from the end portion in the axial direction. A cylindrical lamp having a lead wire, a temporary fixing portion that abuts against the end portion of the lamp and holds the lamp lightly, and the lead located at the axial extension portion of the lamp held by the temporary fixing portion. A holder for holding an end portion of the lamp, the holder having an end portion of the lamp having a lead wire connection portion connected to a wire and an external connection portion electrically connected to the outside of the unit, and the lead wire connection portion of the connection fitting. A slit into which the lead wire is fitted is formed.

According to another aspect of the present invention, there is provided a lamp unit for a document reading apparatus, which has a lead wire extending in an axial direction from an end thereof, a cylindrical lamp having a sharp directivity of irradiation light around the axis, and an end portion of the lamp. A temporary fixing portion that abuts against and lightly holds it, and a lead wire connecting portion that is located at an axial extension of the lamp that is held by the temporary fixing portion and that is connected to the lead wire and that is electrically connected to the outside of the unit. A holder for holding an end portion of the lamp, the holder having a connecting fitting having an external connecting portion, wherein the lead wire connecting portion of the connecting fitting is formed with a slit into which the lead wire is fitted. And

A lamp unit for a document reader according to a third aspect is the lamp unit for a document reader according to the first or second aspect, wherein the slit is formed in a plate-shaped portion orthogonal to the axial direction, and A guide surface for guiding the lead wire to the slit is formed on the plate-shaped portion.

A lamp unit for a document reader according to a fourth aspect is the lamp unit for a document reader according to the third aspect, characterized in that two of the plate-shaped portions are formed in parallel.

A lamp unit for a document reading apparatus according to a fifth aspect is the lamp unit for a document reading apparatus according to any one of the first, second, third, and fourth aspects, wherein the irradiation window is provided in a predetermined direction on the temporary fixing portion. It is characterized in that a mark for aligning the position of the lamp so as to face is formed.

A lamp unit for a document reading apparatus according to a sixth aspect is the lamp unit for a document reading apparatus according to any one of the first, second, third, fourth and fifth aspects, wherein the lamp has the irradiation window with its axis interposed. The holder is provided with an auxiliary electrode connecting fitting having an auxiliary electrode on the outer peripheral surface facing the auxiliary electrode, and having a pressure 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. Is characterized by.

A lamp unit for a document reading apparatus according to a seventh aspect is the lamp unit for a document reading apparatus according to the sixth aspect, wherein the auxiliary electrode connecting fitting has a curved portion along the outer peripheral surface of the lamp. The pressure contact portion is formed on the curved portion.

A lamp unit for an original reading apparatus according to an eighth aspect is the lamp unit for an original reading apparatus according to the sixth or seventh aspect, in which the auxiliary electrode has another portion that is press-contacted with the connecting fitting for the auxiliary electrode. It is characterized in that it is formed thicker than the part.

A lamp unit for a document reading apparatus according to a ninth aspect is the lamp unit for a document reading apparatus according to the sixth, seventh or eighth aspect, in which the auxiliary electrode is opposed to the pressure contact portion of the auxiliary electrode connecting fitting. The part to be formed is formed in a ring shape along the outer peripheral surface of the lamp.

[0039]

According to the lamp unit for the document reading apparatus of the first or second 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 held lightly. . Since the end 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 position around the axis can be easily adjusted.

The holder has a connection fitting, and the connection fitting is located at an extension in the axial direction of the lamp held by the temporary fixing portion and connected to the lead wire. Since the external connection portion that is electrically connected to the lamp is provided, connecting the lead wire of the lamp held by the temporary fixing portion to the lead wire connection portion enables conduction to the outside through the connection fitting.

Moreover, the lead wire connecting portion of the connecting fitting is
Since the slit into which the lead wire is fitted is formed, the lead wire can be easily connected to the lead wire connecting portion by fitting the lead wire into the slit.

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

Even when a resin similar to the conventional one 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 extension portion in the axial direction of the lamp. The bending force and the twisting force, which are generated 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 before the resin is filled and 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 the document reading apparatus of the first or second aspect, the positional accuracy around the axis of the lamp can be ensured, and the positioning work can be easily performed.

Moreover, the lead wire can be easily connected to the lead wire connecting portion.

According to the lamp unit for an original reading device of the third aspect, in the lamp unit for the original reading device of the first or second aspect, the slit is formed in a plate-shaped portion orthogonal to the axial direction. Moreover, since the guide surface for guiding the lead wire to the slit is formed in the plate-shaped portion, the lead wire can be more easily connected to the lead wire connecting portion.

According to the lamp unit for an original reading device of the fourth aspect, in the lamp unit for the original reading device of the third aspect, since the two plate-shaped portions are formed in parallel, the two sheets are formed. By pushing the part of the lead wire located between the plate-shaped parts of toward the slit,
Since the lead wire can be more easily connected to the lead wire connecting portion, and the lead wire is connected to the lead wire connecting portion at the two slit portions, a more reliable connection state can be obtained.

According to the document reading device lamp unit of the fifth aspect, in the document reading device lamp unit of the first, second, third, or fourth aspect, the irradiation window is provided in the temporary fixing portion. Since the mark for aligning the position of the lamp is formed so as to face the direction, the position can be adjusted more easily.

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

According to a lamp unit for a document reading device of a sixth aspect, in the lamp unit for a document reading device of the first, second, third, fourth, or fifth aspect, the lamp has the axis thereof sandwiched therebetween. The holder is provided with an auxiliary electrode connecting fitting that has an auxiliary electrode on the outer peripheral surface facing the irradiation window, and has a pressure 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. Therefore, when the lamp is set in the holder, the auxiliary electrode and the pressure contact part of the auxiliary electrode connection metal fitting are electrically connected by pressure contact, and the auxiliary electrode can be electrically connected to the outside through the auxiliary electrode connection metal 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, becomes unnecessary, and therefore, when the lamp is rotated for the alignment, the lead wire is used. It is possible to prevent the situation that the line is disconnected and the continuity cannot be obtained.

According to the lamp unit for the document reading apparatus of the seventh aspect, in the lamp unit for the document reading apparatus of the sixth aspect, the auxiliary electrode connecting fitting has a curved portion along the outer peripheral surface of the lamp. Since the pressure contact portion is formed on the curved portion, the auxiliary electrode and the auxiliary electrode connecting fitting are reliably connected even when the lamp is rotated to adjust the position of the lamp.

According to the lamp unit for an original reading device of the eighth aspect, in the lamp unit for the original reading device of the sixth or seventh aspect, the auxiliary electrode has a portion which is pressed against the connecting fitting for the auxiliary electrode. Since it is formed to be thicker than the other portions, the connection between the auxiliary electrode and the pressure contact portion of the auxiliary electrode connecting fitting can be made more reliable.

According to a lamp unit for a document reading device of a ninth aspect, in the lamp unit for a document reading device of the sixth, seventh, or eighth aspect, the auxiliary electrode is a press-contact portion of the auxiliary electrode connecting fitting. Since the part facing to is formed in a ring shape along the outer peripheral surface of the lamp,
The connection between the auxiliary electrode and the pressure contact portion of the auxiliary electrode connecting fitting can be made even more reliable.

[0056]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a lamp unit for a document reading apparatus according to the present invention.

In the figure, U is a lamp unit for the document reading apparatus, and 40 is a wire harness connected to the lamp unit U.

The lamp unit U comprises a cylindrical lamp 10
And a holder 2 made of synthetic resin for holding the end portion of the lamp 10.
0 and a holder cover 30.

There are three lamps 10. The lamp 10R emits red light, 10G emits green light, and 10B emits blue light. These lamps 10R, 10G, 10B
Since each has basically the same configuration as the lamp described as the prior art, the description thereof will be omitted. The lamp in this embodiment is different from the conventional lamp in the structure of the auxiliary electrode, which will be described later.

The holder 20 has three temporary fixing portions 21, 2.
2, 23, three connection fittings 24, and auxiliary electrode connection fittings 25.

As shown in FIG. 2, temporary fixing portions 21, 22,
Each of the 23 has a slightly different shape, but each is formed in an arc shape (almost horseshoe shape).
It is formed integrally with the base portion 26 of the holder via 1a, 22a and 23a.

As shown in FIG. 3, temporary fixing portions 21, 22,
Radius (or radius of curvature) R1, R2, R of the inner surface of 23
3 is set to be slightly smaller than the outer diameter of the lamp to be held. Further, the temporary fixing portions 21, 22, 23
At the tip of the lamp, convex portions 21b, 22b and 23b are formed which come into contact with the outer peripheral surface 10a (see FIG. 2) of the lamp due to the elasticity of the temporary fixing portions 21, 22 and 23. As a result, the temporary fixing portions 21, 22, and 23 can come into contact with the end portion 10b of the lamp and hold it lightly. The elastic force of the temporary fixing portions 21, 22, 23 can be adjusted by appropriately setting the widths (lengths in the left-right direction in FIG. 3) of the connecting portions 21a, 22a, 23a.

Marks M1, M2, M3 for aligning the positions of the lamps are formed on the side surfaces of the temporary fixing portions 21, 22, 23. 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. 4, the connecting fitting 24 is a lead wire connecting portion 24a connected to the lead wire 11 of the lamp.
2 and an external connection portion 24b that is electrically connected to the outside of the unit, and are provided in the recesses 27 formed in the holder 20, respectively, as shown in FIG. The lead wire connecting portion 24a is located at the axially extending portion of the lamp 10 held by the temporary fixing portion.

As shown in FIG. 4, the lead wire connecting portion 24a has two parallel plate-like portions 24d which are orthogonal to the axial direction of the lamp 10, and the plate-like portion 24d has slits 24e. A guide surface 24f for guiding the lead wire 11 is formed in the slit 24e.

The external connecting portion 24b is the lead wire connecting portion 24.
It is formed in a needle shape integral with a and is bent as shown in FIG. 4, and its tip end portion 24c has a base portion 26 of the holder.
And penetrates downward and projects downward from the base portion. This protruding portion 24c constitutes a connection terminal with the connector 41 of the wire harness 40 shown in FIG. When the holder 20 is molded, the connecting fitting 24 can be simultaneously incorporated by embedding the external connecting portion 24b in the base portion 26 thereof.

As shown in FIG. 1, a set groove 28 for setting the end 10b of the lamp is formed between the connection fitting 24 and the temporary fixing portions 21, 22, 23.

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, 10B glass tube 13 at a position facing the irradiation window 16 (see FIG. 2) with the axis line therebetween. The end portion 17a of the auxiliary electrode 17 in this embodiment is slightly thicker than the other portion 17b and is formed in a ring shape along the outer peripheral surface of the lamp. This thick portion 17a is connected to the auxiliary electrode. It is designed to come into pressure contact with the metal fitting 25. The end portion 17a does not necessarily have to be thick.

The auxiliary electrode connecting fitting 25 is shown in FIG.
As shown in (b), it is composed of a metal plate having a spring property, and has a pressure contact portion 25a that is in pressure contact with the thick portion 17a of the auxiliary electrode 17, and an external connection portion 25b that is electrically connected to the outside of the unit.
And have.

The auxiliary electrode connecting fitting 25 has a C-ring-shaped curved portion 25e along the outer peripheral surface of the lamp 10, and the pressure contact portion 25a is formed in the curved portion 25e through a slit 25f. . The pressure contact portion 25a may be formed by the curved portion 25e without forming the slit 25f.

Further, for example, as shown in FIGS. 6 (c) and 6 (d), the curved portion 25e 'is formed in a J shape in a side view, and
As shown in (e), the straight portion 25g and the thick portion 17a of the auxiliary electrode 17 may mainly be pressed against each other. As will be described later, the end portion 10b of the lamp and the holder 20
When a resin such as silicone rubber is filled between the end and the end, the resin does not flow up below the lamp end portion 10b, and the end portion 10b of the lamp is not lifted from the curved portion 25e 'due to contraction during curing. I can't say, but the straight part 25g
With the structure in which the thick portion 17a of the auxiliary electrode 17 and the auxiliary electrode 17 are brought into pressure contact with each other, the auxiliary electrode 17 and the auxiliary electrode connecting fitting 25
It is possible to secure continuity with.

The external connection portion 25b is formed integrally with the press contact portion 25a, and after being guided by the guide groove 26a formed in the base portion 26, the needle portion 25d is bent and the tip portion 25c thereof is held in the holder. It penetrates through the base portion 26 and projects downward from the base portion. The projecting portion 25c constitutes a connection terminal with the connector 41 of the wire harness 40, like the tip portion 24c of the connecting fitting described above. In FIG. 6B, 29 is a recess into which the connector 41 is fitted. When the holder 20 is molded, the auxiliary electrode connecting fitting 25 can be simultaneously incorporated by embedding the needle-like portion 25d of the external connecting portion 25b in the base portion 26 thereof.

Although the holder has been described above, the left and right holders are constructed symmetrically, and in the holder on the right side in FIG. 1, the auxiliary electrode connecting fitting 25 corresponds to the blue light lamp 10b. It is provided.

7A and 7B are views showing the cover 30, FIG. 7A is a front view, FIG. 7B is a bottom view, and FIG. 7C is a right side view when FIG.

On the bottom surface of the cover 30, when the cover 30 is attached to the holder 20, the plate-like portion 24 of the connecting fitting 24 is provided.
and a second protrusion 32R, 32G, 32B that presses the end portion of the lamp from above. There is.

Next, the steps of assembling the lamp unit as described above, 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 setting groove 2 are set.
The end portion 10b of the lamp is lightly pushed into the No. 8 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, the lead wire 11 is guided by the guide surface 24f of the connecting fitting, and the upper end (slit entrance) 24g of the slit 24e of the lead wire connecting portion 24a (FIG. 4B).
(See) and placed.

Further, the end portion 10b of the lamp comes into contact with the temporary fixing portion and is held lightly. Since the convex portions 21b, 22b, and 23b are formed in the temporary fixing portions 21, 22, and 23, the end portion 10b of the lamp does not float up. Therefore, the lead wire 11 has the upper end of the slit 24e. It will be in a state of being placed on 24 g.

Further, the lamp 10 having the auxiliary electrode 17 is provided.
As for G and 10B, when they are set in the set groove 28, the end portion 17a of the auxiliary electrode and the pressure contact portion 25a of the auxiliary electrode connecting fitting 25 are pressed to be electrically connected. The end portion 17a is thicker than other portions and is formed in a ring shape along the outer peripheral surface of the lamp, and the auxiliary electrode connecting fitting 25 has a C-ring shaped curved portion 25e along the outer peripheral surface of the lamp 10. Has this curved portion 25e
Since the press contact portion 25a is formed on the surface, the connection is surely made.

(Ii) The lamps 10R, 10G, and 10B are pinched by fingers or a predetermined tool, and are rotated about their axes to perform alignment. As for the alignment, as shown in FIG. 2, for the lamp 10R, the edge portion 16a of the irradiation window 16 is aligned with the mark M1 and the lamp 10G.
The edge portion 16a of the irradiation window 16 is marked with M2.
For the lamp 10B, the edge 1 of the irradiation window 16 is
6a is aligned with the mark M3. In addition,
For alignment, 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 aligning a cylindrical lamp that does not have a portion suitable for alignment such as the slit-shaped illumination window 16 but has a sharp directivity of the illumination light around the axis. Is.

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

Moreover, the temporary fixing portion is the end portion 10b of the lamp.
Since it is the part that comes into contact with the mark M1, M
Since M2 and M3 are formed, the alignment can be performed more easily.

Further, the lamp 10 having the auxiliary electrode 17
With respect to G and 10B, since the lead wire for the auxiliary electrode, which has been conventionally required, is not required, when the lamp is rotated for alignment, the lead wire comes off and conduction cannot be obtained. The situation that it ends up is prevented beforehand.
The end portion 17a of the auxiliary electrode is formed in a ring shape along the outer peripheral surface of the lamp, and the auxiliary electrode connecting fitting 25 has a C ring-shaped curved portion 25e along the outer peripheral surface of the lamp 10. Since the press contact portion 25a is formed on the curved portion 25e, even when the lamps 10G and 10B are rotated,
The end portion 17a of the auxiliary electrode 17 and the auxiliary electrode connection fitting 25
The connection with is surely obtained.

(Iii) The lead wire 11 of the lamp is connected to the lead wire connecting portion 24a of the connecting fitting 24. Lead wire 1
Since No. 1 is placed on the upper end 24g of the slit 24e, the portion located between the plate-like portions 24d and 24d is pushed toward the slit 24e with an appropriate tool to easily connect. be able to. Moreover, since the lead wire 11 is connected to the lead wire connecting portion 24a at the two slit portions, a reliable connection state can be obtained. . (Iv) The lamp 10 and the holder 20 are fixed by attaching an adhesive between the end 10b of the lamp and the holder 20.

At this time, a resin such as silicon rubber having an insulating property is used as an adhesive, and this resin is used for the end portion 10 of the lamp.
the lamp 10 by filling the space between the holder 20 and the holder 20b.
Even when the holder 20 and the holder 20 are fixed to each other, since the lead wire 11 of the lamp is connected to the lead wire connecting portion 24a located in the extension portion of the lamp in the axial direction, Has almost no bending force or twisting force that occurs in the prior art.

Therefore, the lamp 10 is prevented from moving due to the restoring force based on the elasticity of the lead wire 11 before the resin is filled and the resin is solidified, and the positional accuracy of the lamp 10 around the axis is highly accurate. 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 attached after filling the space between the end portion 10b of the lamp and the holder 20.

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

In such a lamp unit, as shown in FIG. 1, with respect to the connecting terminals formed by the tip ends 24c and 25 of the connecting metal fittings and the auxiliary electrode connecting metal fittings protruding from the lower surface of the holder 20, as shown in FIG. The connector 41 of the wire harness 40 is connected to, and power is supplied to the lamp 10 through the wire harness 40.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be appropriately made within the scope of the gist of the present invention.

[0093]

According to any of the first to fifth aspects of the present invention, it is possible to secure the positional accuracy around the axis of the lamp and to easily perform the positioning work.

Further, according to any of the sixth to ninth aspects of the invention, it is possible to secure the conduction to the auxiliary electrode in the lamp having the auxiliary electrode.

[0095]

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a lamp unit for a document reading apparatus according to the present invention.

FIG. 2 is a side view showing the action of a temporary fixing portion.

FIG. 3 is a side view showing a temporary fixing portion.

4A and 4B are diagrams showing connection fittings, in which FIG. 4A is a plan view and FIG.
Is a front view and (c) is a left side view.

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

FIG. 6A is a perspective view of an auxiliary electrode connecting fitting, and FIG.
Is a cross-sectional view showing a state in which the auxiliary electrode connecting fitting is incorporated into the holder, (c) is a perspective view of a modification of the auxiliary electrode connecting fitting, and (d) is a perspective view showing the auxiliary electrode connecting fitting in the holder. Sectional drawing, (e) is sectional drawing which shows the connection state of the metal fitting for auxiliary electrodes, and an auxiliary electrode.

7A and 7B are views showing a cover, FIG. 7A is a front view, FIG. 7B is a bottom view, and FIG. 7C is a right side view when FIG.

FIG. 8 is a sectional view showing 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 sectional view taken along line bb in FIG. 10A.

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

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

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

[Explanation of symbols]

10 lamps 10a Lamp outer peripheral surface 10b end of lamp 11 lead wire 16 irradiation window 17 Auxiliary electrode 17a thick part 20 holder 21-23 Temporary stop M1 to M3 marks 24 Connection bracket 24a Lead wire connection part 24b External connection 24d flat plate part 24e slit 25 Auxiliary electrode connection fitting 25a Pressure contact part 25b External connection

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-3-141343 (JP, A) JP-A-3-89487 (JP, A) JP-A-62-142465 (JP, A) JP-A-56- 4013 (JP, A) JP-A-5-176113 (JP, A) Actually open 62-181065 (JP, U) Actually open 4-92868 (JP, U) Actually open 62-26890 (JP, U) Actual development 3-26128 (JP, U) Actual development Sho 62-112252 (JP, U) Actual development 5-6969 (JP, U) Actual development 5-50455 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 1/024-1/207

Claims (9)

(57) [Claims] 1. A cylindrical lamp having a slit-shaped irradiation window extending in the axial direction and a lead wire extending from the end in the axial direction, and a temporary fixing for abutting against the end of the lamp and lightly holding it. And a connecting metal fitting, which is located at an extension of the lamp in the axial direction and which is held by the temporary fixing portion, has a lead wire connecting portion connected to the lead wire and an external connecting portion electrically connected to the outside of the unit. A lamp unit for a document reading device, comprising: a holder for holding an end portion of a lamp; and a slit into which the lead wire is fitted, formed in a lead wire connecting portion of the connecting fitting. 2. A cylindrical lamp having a lead wire extending from the end portion in the axial direction and having a sharp directivity of irradiation light around the axis, and a temporary fixing for abutting the end portion of the lamp and lightly holding it. And a connecting metal fitting, which is located at an extension of the lamp in the axial direction and which is held by the temporary fixing portion, has a lead wire connecting portion connected to the lead wire and an external connecting portion electrically connected to the outside of the unit. A lamp unit for a document reading device, comprising: a holder for holding an end portion of a lamp; and a slit into which the lead wire is fitted, formed in a lead wire connecting portion of the connecting fitting. 3. The slit is formed in a plate-shaped portion orthogonal to the axial direction, and a guide surface for guiding the lead wire to the slit is formed in the plate-shaped portion. The lamp unit for a document reading device according to claim 1. 4. The lamp unit for a document reading apparatus according to claim 3, wherein the plate-shaped portions are formed in parallel with each other. 5. The mark for aligning the position of the lamp so that the irradiation window faces in a predetermined direction is formed in the temporary fixing portion. A lamp unit for the document reading apparatus described. 6. The lamp has an auxiliary electrode on an outer peripheral surface facing the irradiation window with the axis of the lamp interposed therebetween, and a press-contact portion press-contacted with the auxiliary electrode and an external connection portion electrically connected to the outside of the unit. 2. The auxiliary electrode connecting metal fitting comprising: is provided on the holder.
A lamp unit for a document reading device according to 3, 4, or 5. 7. The original document according to claim 6, wherein the auxiliary electrode connecting fitting has a curved portion along an outer peripheral surface of the lamp, and the press contact portion is formed on the curved portion. Lamp unit for reading device. 8. The document reading apparatus according to claim 6, wherein a portion of the auxiliary electrode, which is in pressure contact with the auxiliary electrode connecting fitting, is formed thicker than other portions. Lamp unit. 9. The auxiliary electrode is characterized in that a portion facing the pressure contact portion of the auxiliary electrode connecting fitting is formed in a ring shape along the outer peripheral surface of the lamp.
Alternatively, the lamp unit for the document reading apparatus according to item 8.