JP2010067416A - Linear light source device, and assembling method of linear light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear light source device, capable of reducing, even if a light guide member is set with its central axis being displaced from the optical axis of a light source, the light escaping through between the light guide member and the light source to maintain the illuminance. <P>SOLUTION: In the linear light source device 1 in which the long light guide member 4 having a light intake part 42 at one end portion and the light source 3 disposed to face the light intake part 42 are fixed on a base 2, the light intake part 42 of the light guide member 4 is formed into a curved surface rotationally symmetric around the central axis of the member 4, and an emitting surface 31 of the light source 3 is formed into a curved surface rotationally symmetric around the central axis of the light source 3. A connecting member 5 is disposed between the light intake part 42 of the light guide member 4 and the emitting surface 31 of the light source 3, the boundary surface with the light guide member 4 of the connecting member 5 is formed into a curved surface rotationally symmetric around the central axis of the connecting member, and the boundary surface with the light source 3 of the connecting member 5 is formed into a curved surface rotationally symmetric around the central axis of the connecting member 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a linear light source device used as an illumination light source of an image reading apparatus used for a facsimile, a copying machine, an image scanner, a barcode reader, and the like, and a method for assembling the linear light source device.

  2. Description of the Related Art In recent years, in an image reading apparatus such as a personal facsimile, a small and low power consumption LED is used as a light source of a reading light source device by improving output of a light emitting diode (hereinafter referred to as LED) and increasing sensitivity of a CCD sensor as a light receiving element. Has come to be used as. A conventional linear light source device including such an LED as a light source is configured to cause light emitted from the light source to enter a light guide member for the purpose of reducing the number of light sources and obtaining uniform illumination intensity. A configuration in which light is guided in a desired direction is known.

FIG. 7 is a diagram showing a configuration of a linear light source device 1 disclosed in JP-A-9-163080 as a conventional linear light source device.
The linear light source device 1 includes a light guide member 4 made of a transparent resin and a light source 3 made of an LED fixed to a long base 2. In the light guide member 4, one end surface in the axial direction of the rod-shaped member is a light capturing portion 42, and the light source 3 is disposed so as to face the light capturing portion 42. The light source 3 is disposed at one end of the base 2 so that the optical axis extends parallel to the base 2 and coincides with the central axis of the light guide member 4. Light emitted from the light source 3 enters the light guide member 4 from the light capturing portion 42 and is emitted from the light guide member 4 as a linear light source.
JP-A-9-163080

  However, since there is a gap between the light guide member 4 and the light source 3, out of the light emitted from the light source 3, light that is not guided to the inside of the light guide member 4 is generated. Further, when the central axis of the light guide member 4 and the optical axis of the light source 3 are arranged slightly shifted, not only the light exiting from the gap increases, but also the light distribution of the light incident on the inside of the light guide member 4 Will also be different. In such a linear light source device 1, the light emitted from the light source 3 in the light guide member 4 cannot be sufficiently utilized, and a desired irradiance as a linear light source cannot be obtained.

  In view of the above-described problems, the present invention reduces the light emitted from between the light guide member and the light source even when installed with the center axis of the light guide member and the optical axis of the light source shifted. It aims at providing the linear light source device which can maintain illumination intensity.

  In the first invention of the present application, a long light guide member having one end portion serving as a light capturing portion and a light source disposed so as to face the light capturing portion are fixed to a base. In the linear light source device, the light capturing portion of the light guide member is a curved surface that is rotationally symmetric about the central axis of the light guide member, and the emission surface of the light source is around the central axis of the light source The connecting member is disposed between the light capturing portion of the light guide member and the radiation surface of the light source, and the boundary surface of the connecting member with the light guide member is The curved surface is rotationally symmetric about the central axis of the connecting member, and the boundary surface between the connecting member and the light source is a curved surface rotationally symmetric about the central axis of the connecting member.

  Further, according to the second invention of the present application, a long light guide member having one end portion serving as a light capturing portion and a light source disposed so as to face the light capturing portion are provided in a socket. In the linear light source device fixed inside, the light capturing portion of the light guide member is a curved surface that is rotationally symmetric about the central axis of the light guide member, and the emission surface of the light source is A curved surface that is rotationally symmetric about a central axis, and a connection member is disposed between the light capturing portion of the light guide member and the radiation surface of the light source, and the boundary of the connection member with the light guide member The surface is a curved surface that is rotationally symmetric about the central axis of the connecting member, and the boundary surface of the connecting member with the light source is a curved surface that is rotationally symmetric about the central axis of the connecting member. To do.

  Further, according to a third invention of the present application, in the first invention or the second invention, the light capturing portion of the light guide member is a hemispherical curved surface, and the emission surface of the light source is a hemispherical curved surface. The boundary surface between the connection member and the light guide member and the boundary surface between the connection member and the light source are hemispherical curved surfaces.

  In addition, the fourth invention of the present application fixes a light source whose radiation surface is a rotationally symmetric curved surface around the central axis to a base, and subsequently, a light source side end surface that becomes an interface with the light source, a light guide member, Connect the connecting member, which has a curved surface that is rotationally symmetric about the central axis, to the light guide member side end surface that becomes the interface of the light source, and rotate it to the radiation surface of the light source. A long light guide member having a curved surface that is rotationally symmetric about a central axis is connected to a connection member while being fixed to a base.

  In addition, the fifth invention of the present application fixes a long light guide member having a curved optically symmetrical curved surface around a central axis to a light guide at one end, and then a light source and A connecting member in which a light source side end surface serving as an interface of the light source and a light guide member side end surface serving as an interface with the light guide member are curved symmetrically about the central axis with respect to the light capturing portion of the light guide member A light source that is rotatably connected and finally has a radiation surface that is a rotationally symmetric curved surface around the central axis is connected to a connection member while being fixed to a base.

  The sixth invention of the present application is characterized in that, in the fourth invention or the fifth invention, after the light source, the connection member, and the light guide member are coupled, the light guide member is pressed in the axial direction toward the light source. And

  The seventh invention of the present application is characterized in that, in the fourth invention or the fifth invention, after the light source, the connecting member, and the light guide member are coupled, the light source is pressed in the axial direction toward the light guide member. And

  According to the first and second inventions of the present application, even if the light guide member and the light source are fixed to the base, the light source, the connection member, and the light guide are arranged by inclining the connection member accordingly. The member can be arranged so as not to generate a gap. And it can prevent that the light radiated | emitted from the light source leaks in the boundary surface with a connection member, or a boundary surface with a light guide member, and can be efficiently taken in into a light guide member via a connection member.

  According to the third aspect of the present invention, since the curved surface of the spherical surface has the same degree of bending at every location, the light guide member side end surface that becomes the boundary surface with the light guide member of the connection member is a hemispherical curved surface, and the light of the light guide member By making the taking-in part a hemispherical curved surface, even when the center axes of the taking-in parts are deviated, they can slide like a spherical hinge and maintain the state where the light-guiding member side end face and the light taking-in part are in close contact with each other.

  According to the fourth aspect of the present invention, the light source fixed to the base is guided to the light source via the connection member in which the interface between the light source and the light guide member is a curved surface that is rotationally symmetric about the central axis. By fixing the optical member to the base, even if the central axis of the light source and the central axis of the light guide member are not aligned on the same line, the connecting member slides on the interface and rotates by itself. The light guide member can be connected so as not to generate a gap.

  According to the fifth invention of the present application, the light guide member fixed to the base is connected to the light source member and the interface between the light guide member and the light guide member via a connecting member whose curved surface is rotationally symmetric about the central axis. By fixing the light source to the base, the connection member slides at the interface and rotates naturally even if the central axis of the light source and the central axis of the light guide member are not aligned on the same line. The light guide member can be connected so as not to generate a gap.

  According to the sixth and seventh inventions of the present application, after connecting the light source, the connecting member, and the light guide member, by pressing the light guide member in the axial direction toward the light source, the gap in the axial direction is eliminated, The light guide member, the connection member, and the light source can be closely connected.

A first embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing the internal structure of a copying machine in which the linear light source device 1 of the present invention is incorporated.
A document placed on a transparent glass plate is irradiated with light emitted from the linear light source device 1 from below. The light applied to the white portion where nothing is written on the original is reflected, reflected by a plurality of mirrors and guided to enter the reading CCD through a lens. By moving the rod-shaped linear light source device 1 and one mirror as a set in the direction of the arrow, the contents of the entire document can be read.

FIG. 2 is a perspective view showing an example of the linear light source device 1 of the present invention.
In the linear light source device 1 of the present invention, a light guide member 4 made of transparent resin and a light source 3 made of LED are fixed to a base 2 and are held between the light guide member 4 and the light source 3 and held. 5 is configured. The base 2 is configured by combining a light guide member holding part 22 made of resin and a light source holding part 21 made of metal, and fixing the light guide member holding part 22 and the light source holding part 21 with screws 28. The light source holding part 21 is provided with a long hole, and the screw 28 can slide the long hole. Therefore, the light source holding part 21 is slid in the direction of the arrow in the drawing, that is, in the longitudinal direction of the light guide member holding part 22, and further, It is comprised so that the position of the light source 3 fixed to the light source holding part 21 with respect to the light guide member 4 fixed to the light guide member holding part 22 can be adjusted.

  The light guide member holding portion 22 has a bar-like shape having a U-shaped cross section with an open side surface extending in the longitudinal direction. Since one side surface is open, the light guide member 4 can be fitted into the light guide member holding portion 22. The light guide member 4 is fixed to the upper surface of the light guide member holding part 22 by a plurality of claws installed along the longitudinal direction. Moreover, since the light guide member 4 does not become so hot even when the light source 3 is turned on, the light guide member holding portion 22 is formed of resin.

On the other hand, the light source holding part 21 is preferably made of metal in order to hold the light source 3 that becomes high temperature during lighting. Furthermore, the fin 24 extended along the longitudinal direction of the light guide member holding | maintenance part 22 is attached, and it is comprised so that the heat which generate | occur | produces from the light source 3 can be cooled effectively. The light source 3 is fixed to a surface of the side surface 23 that is perpendicular to the longitudinal direction of the light guide member holding portion 22 and faces the light guide member holding portion 22 so that light is emitted toward the light guide member holding portion 22. Configured.
In addition, the attachment position of the fin 24 is not limited to FIG. 2, and the fin 24 can be attached to the light source holding unit 21 facing the light source 3.

  In order to release the heat generated from the light source 3 to the outside from the light source holding unit 21, the LED of the light source 3 is installed on the circuit board, and the circuit board is attached in close contact with the side surface 23. A power supply line 33 is attached to one end of the circuit board with screws and wired to the circuit board.

  If there is no need to say whether the manufacturing cost is present, it is possible to manufacture the base 2 with accurate dimensions and horizontal planes. However, in order to provide the linear light source device 1 at a price required by the market, it is not possible to require so high precision in the production of the base 2. For example, it is difficult to flow the undiluted resin solution uniformly into the mold into which resin is poured in a strict sense, and it is difficult to control the cooling of the resin so that it is uniformly cooled on all sides, so it is manufactured for each member. An error occurs. In the first place, since the mold for pouring the resin cannot be installed in search of a precise horizontal plane, the horizontal plane of the light guide member holding portion 22 may be slightly shifted. Further, even in the light source holding unit 21 made of metal, if it is formed by press processing in order to reduce the manufacturing cost, it is difficult to make the press pressure completely uniform, and thus a manufacturing error occurs.

  As described above, in the linear light source device 1, unlike a precision machine or the like, there is a manufacturing error in the base 2 itself that fixes the light guide member 4 and the light source 3. Therefore, even if the light guide member 4 held by the light guide member holding portion 22 whose horizontal plane is not densely projected is aligned with the light source holding portion 21 to which the light source 3 is fixed, the light guide member. The central axis of 4 cannot be made completely coincident with the optical axis of the light source 3. For these reasons, the light guide member 4 and the light source 3 are fixed to the base 2 in a state where the center axis of the light guide member 4 and the optical axis of the light source 3 are shifted from each other. This is a prerequisite for the light source device 1.

FIG. 3 is an enlarged cross-sectional view in which the light guide member 4, the connecting member 5, and the light source 3 excluding the base 2 of the linear light source device 1 of the present invention are cut in the axial direction.
A light capturing portion 42 is provided at one end of the light guide member 4 in the axial direction, and the other end is a smooth surface 43. On the axial side surface 44 extending in the axial direction of the light guide member 4, a light emitting surface 41 and a knurled groove 45 are formed from one end where the light capturing portion 42 is formed toward the other end which is the smooth surface 43. Has been.

  The knurled groove 45 is provided with a plurality of grooves that are perpendicular to the axial direction of the light guide member 4 and cut in the radial direction from the knurled groove 45 to the light emitting surface 41, and a flat surface 46 is formed at the top of each groove. ing. Since the amount of light guided to the inside of the light guide member 4 decreases as the distance from the light capturing portion 42 increases, the length of the flat surface 46 is shortened as the distance from the light capturing portion 42 increases. The amount of light reflected by the knurled groove 45 is made uniform. Further, in order to make the amount of light more uniform, the height of each groove can be adjusted so as to increase from the vicinity of the light capturing portion 42 to the vicinity of the smooth surface 43, and the width of the groove can be increased.

  The light capturing portion 42 is a boundary surface with the connection member 5 disposed adjacent to the light guide member 4, and rotates around the central axis of the light guide member 4 that is recessed inward of the light guide member 4. It is a symmetric concave hemispherical curved surface. The curved surface that is rotationally symmetric about the axis center of the light capturing portion 42 of the light guide member 4 is preferably a hemisphere in which the angle at which the curved surface is formed has a cross section of 180 °. When the angle at which the curved surface is formed is 180 ° or less in cross section, the light transmission efficiency is lowered, but the connection member 5 and the light guide member 4 can be arranged in close contact, and light leaks at the boundary surface. Can be prevented.

  The connection member 5 includes a light guide member side end surface 51 having a circular cross section, a light source side end surface 52 having a circular cross section having a smaller diameter than the light guide member side end surface 51, and a space between the light guide member side end surface 51 and the light source side end surface 52. This is a cone-shaped component having an inclined surface 53 connecting the two. A light guide member-side end surface 51 serving as a boundary surface with the light guide member 4 is a convex hemispherical curved surface that is rotationally symmetric about the central axis of the connection member 5 protruding toward the light guide member 4. Further, the light source side end surface 52 that becomes a boundary surface with the light source 3 is a concave hemispherical curved surface that is rotationally symmetric about the central axis of the connection member 5 that is recessed inward of the connection member 5.

  In order to efficiently take in the light emitted from the light source 3 into the light guide member 4, the light guide member 4 is disposed so that no gap is formed between the connection member 5 and the light guide member 4. Specifically, the end surface 51 on the light guide member side, which is a boundary surface between the connection member 5 and the light guide member 4, is formed to be equal to the curvature of the light capturing portion 42 of the light guide member 4. Moreover, the clearance gap formed between the light guide member 4 and the connection member 5 can be made smaller by connecting the light guide member 4 and the connection member 5 with an adhesive agent.

  An inclined surface 53 serving as an interface with the air layer of the connection member 5 is provided with an inclination that spreads from the light source side end surface 52 near the light source 3 toward the light guide member side end surface 51. The incident angle of the light emitted from the light source 3 with respect to the inclined surface 53 having such an inclination is larger than the incident angle with respect to the boundary surface parallel to the central axis. Further, since the refractive index of the transparent resin forming the connection member 5 is larger than the refractive index of air, the light is totally reflected if the incident angle of light is greater than or equal to a certain angle on the inclined surface 53 that is an interface with the air layer of the connection member 5. . Therefore, since the amount of light that makes the incident angle larger than the critical angle increases, the light penetrating from the interface of the connection member 5 with the air layer decreases, and the light taken into the connection member 5 can be increased.

  The light source 3 is a white LED that emits white light. A currently popular method as a white LED is a Cos light distribution LED combining a blue LED and a YAG phosphor (YAG; Yttrium Aluminum Garnet) that absorbs blue light and emits yellow light. By covering the LED chip with a YAG phosphor mixed with resin around the LED chip, the light emitted from the blue light and the blue light source collides with the YAG particles, and white light is obtained by mixing the excited yellow light. Further, the fluorescent color of the YAG phosphor has a complementary color relationship with the emission color of the blue LED, and white light can be obtained efficiently.

  Since a lens-type LED is used as the light source 3, a hemispherical lens is disposed on the light emission surface 31. In order to efficiently capture light emitted from the light source 3 into the light guide member 4, the light source 3 is disposed so as not to form a gap as an air layer between the connection member 5. Specifically, the light source side end surface 52 that is a boundary surface between the connection member 5 and the light source 3 is formed to be equal to the curvature of the radiation surface 31 of the light source 3. Moreover, the clearance gap formed between the light source 3 and the connection member 5 can be made smaller by connecting the light source 3 and the connection member 5 with an adhesive agent.

FIG. 4 is an enlarged cross-sectional view of a connection portion between the light guide member 4, the connection member 5, and the light source 3, showing a state in which the central axis A of the light guide member 4 and the central axis B of the light source 3 are displaced in the vertical direction. is there.
As described above, since there is a manufacturing error in the base 2 itself, the light guide member 4 and the light source 3 are in a state where the central axis A of the light guide member 4 and the central axis B of the light source 3 are shifted. It will be fixed to 2. The base 2 shown in FIG. 2 slides the light source holding part 21 in a direction perpendicular to the longitudinal direction of the light guide member holding part 22 to hold the light source for the light guide member 4 fixed to the light guide member holding part 22. Since the position of the light source 3 fixed to the portion 21 can be adjusted, the lateral displacement between the light guide member 4 and the light source 3 is somewhat improved. However, there is no adjustment means for the deviation in the height direction between the light guide member 4 and the light source 3, and the deviation in the base 2 remains as a deviation in the height direction as it is.

Therefore, as shown in FIG. 4, the connection member 5 is disposed between the light guide member 4 and the light source 3 to adjust the deviation between the position of the light guide member 4 and the position of the light source 3.
The light capturing portion 42 that is a boundary surface between the light guide member 4 and the connection member 5 is a hemispherical curved surface, and the light guide member side end surface 51 that is a boundary surface between the connection member 5 and the light guide member 4 is light capture. Since it is a hemispherical curved surface corresponding to the hemispherical curved surface of the insertion portion 42, the hemispherical curved surface of the light guide member side end surface 51 of the connection member 5 slides like a hinge with respect to the hemispherical curved surface of the light capturing portion 42. Even if the member 5 is connected at any angle, it is possible to prevent a gap as an air layer from being formed between the light guide member 4 and the light guide member 4.

  In addition, the radiation surface 31 serving as a boundary surface between the light source 3 and the connection member 5 is a hemispherical curved surface, and the light source side end surface 52 serving as the boundary surface between the connection member 5 and the light source 3 corresponds to the hemispherical curved surface of the radiation surface 31. Since the hemispherical curved surface of the light source side end surface 52 of the connection member 5 slides with respect to the hemispherical curved surface of the radiation surface 31, the light source 3 and the light source 3 can be connected at any angle. It is possible to prevent a gap serving as an air layer from being generated between them.

  Since the central axis A of the light guide member 4 and the central axis B of the light source 3 are displaced in the vertical direction, the position of the light capturing part 42 of the light guide member 4 and the position of the radiation surface 31 of the light source are horizontal. not exist. However, the connection member 5 and the light guide are rotated by rotating the connection member 5 itself so that the axial center C of the connection member 5 is inclined with respect to the central axis A of the light guide member 4 and the central axis B of the light source 3. The member 4 and the connection member 5 and the light source 3 can be closely arranged so that no gap is generated.

  However, since the light guide member 4 and the light source 3 are fixed to the base 2, the positions of the light capturing part 42 of the light guide member 4 and the radiation surface 31 of the light source 3 are determined. Therefore, the position of the light guide member side end surface 51 serving as the boundary surface with the light guide member 4 and the position of the light source side end surface 52 serving as the boundary surface with the light source 3 are determined, and the positions of both ends of the connection member 5 are determined. Therefore, the arrangement direction of the connection member 5 with respect to the light guide member 4 and the light source 3 is determined.

  Even if the light guide member 4 and the light source 3 are fixed to the base 2, the light source 3, the connection member 5, and the light guide member 4 do not have a gap by arranging the connection member 5 so as to be inclined. Can be arranged as follows. And the light radiated | emitted from the light source 3 is prevented from leaking in the boundary surface with the connection member 5, and the boundary surface with the light guide member 4, and it takes in into the light guide member 4 via the connection member 5 efficiently. Can do.

  As shown in the figure, when the circuit board 32 of the light source 3 is larger than the radiation surface 31, when the light source side end surface 52 of the connection member 5 slides with respect to the radiation surface 31 of the light source 3, one end of the light source side end surface 52. Hits the circuit board 32 and the connecting member 5 cannot be tilted any further, and a gap is generated between the connecting member 5 and the light source 3. Therefore, when the central axis B of the light source 3 and the central axis C of the connection member 5 are arranged on the same line, a gap is formed between the circuit board 32 of the light source 3 and the light source side end surface 52 of the connection member 5. The light source side end surface 52 of the connecting member 5 is allowed to slide with respect to the radiation surface 31 of the light source 3.

  On the other hand, in the connection portion between the light guide member 4 and the connection member 5, the slope 53 of the connection member 5 is provided with an inclination that decreases from the light guide member side end surface 51 toward the light source side end surface 52. Is not in contact with one end of the light capturing portion 42 of the light guide member 4. Further, since the incident angle of the light emitted from the light source 3 with respect to the inclined surface 53 is larger than the incident angle with respect to the boundary surface parallel to the central axis, it is shifted from the central axis B of the light source 3 and the central axis C of the connecting member 5. However, the amount of light penetrating through the slope 53 is small, the amount of light totally reflected by the slope 53 can be secured, and the light use efficiency can be made difficult to drop.

  In addition, when the light guide member side end surface 51 of the connection member 5 is a convex hemispherical curved surface and the light capturing portion 42 of the light guide member 4 is a concave hemispherical curved surface, the light guides slide like spherical hinges to guide the light. This is most preferable because the member side end face 51 and the light capturing part 42 are kept in close contact with each other. Similarly, when the light source side end surface 52 of the connection member 5 is a concave hemispherical curved surface and the radiation surface 31 of the light source 3 is a convex hemispherical curved surface, they slide together like a spherical hinge, and the light source side end surface 52 and the radiation surface 31 is most preferable because it maintains a close contact state. However, the light guide member side end surface 51 and the radiation surface 31 may be rotationally symmetric curved surfaces around the central axis as rotational paraboloids or ellipsoidal surfaces, and the light capturing portion 42 or the light source side end surface 52 may be a corresponding curved surface. .

  On the paraboloidal surface and the ellipsoidal surface, if the center axis of the connection member 5 and the light guide member 4 is shifted, a gap is formed between the light guide member side end surface 51 and the light capturing portion 42. It is preferable to join the optical member 4 with a translucent adhesive such as silicone having a refractive index close to both. Similarly, it is preferable that the light source 3 and the connection member 5 are bonded together with an adhesive such as silicone. If the light guide member 4 and the connecting member 5 are positioned before the translucent adhesive is solidified, the translucent adhesive flows to fill the gap, and the light guide member side end face 51 and the light capturing portion 42 An air layer is prevented from being formed between. Moreover, since the paraboloid and the ellipsoid have a higher light condensing effect than the hemispherical surface, it is possible to increase the light along the central axis of the light guide member 4 and increase the light use efficiency.

Then, the assembly method of the linear light source device 1 is demonstrated.
There are roughly two methods for assembling the linear light source device 1. First, a first assembly method for fixing from the light source 3 will be described.
In the first assembly method, first, the light source 3 is fixed to the surface of the side surface 23 of the light guide member holding part 22 of the light source holding part 21 of the base 2 that faces the light guide member holding part 22. Next, an adhesive made of silicone is applied to the surface of the light source side end surface 52 of the connection member 5, and the light source side end surface 52 of the connection member 5 is aligned and coupled to the radiation surface 31 of the light source 3. Since the adhesive made of silicone does not bond the two members instantaneously, even after connecting the connection member 5 to the light source 3, the light source side end surface 52 is slid with respect to the radiation surface 31 to connect the connection member 5. Can be adjusted.

  Subsequently, an adhesive made of silicone is applied to the surface of the light capturing portion 42 of the light guide member 4, and the light guide member 4 is fitted from one side surface of the light guide member holding portion 22 of the base 2 that is open. Meanwhile, the light capturing part 42 is coupled to the light guide member side end face 51 of the connection member 5. After connecting the light source 3, the connection member 5, and the light guide member 4 in this way, the light guide member 4 is moved toward the light source 3 along the central axis A of the light guide member 4, and the light source 3 and the connection member are connected. Press so that there is no gap between 5 and the light guide member 4. At this time, the connection member 5 that is not completely bonded to the light guide member 4 or the light source 3 is rotated and tilted, so that the positional deviation between the light guide member 4 and the light source 3 is absorbed. And the connecting member 5 and the light source 3 can be coupled without generating a gap.

  Thereafter, the light guide member holding part 22 is slid with respect to the light source holding part 21, and the position is finely adjusted so that the central axis A of the light guide member 4 and the central axis B of the light source 3 are aligned as much as possible. .

Then, the 2nd assembly method fixed from the light guide member 4 is demonstrated.
In the second assembly method, the light guide member 4 is first fitted into the light guide member holding portion 22 of the base 2. Then, an adhesive made of silicone is applied to the surfaces of the light guide member side end surface 51 of the connection member 5 and the light source side end surface 52 of the connection member 5, so that the connection member 5 is guided to the light capturing portion 42 of the light guide member 4. The optical member side end surfaces 51 are connected together. Subsequently, the light source 3 is fixed to the light source holding part 21 of the base 2, and the radiation surface 31 of the light source 3 is aligned and connected to the light source side end surface 52 of the connection member 5.

  In order to install the light source 3 having a convex hemispherical curved surface whose radiating surface 31 protrudes toward the connecting member 5 at the end, the side surface 23 of the light source holding part 21 for fixing the light source 3 and the light capturing part 42 of the light guide member 4 It is arranged so that there is room between. Therefore, after connecting the light source 3, the connecting member 5, and the light guide member 4, the light guide member 4 is moved toward the light source 3 along the central axis A of the light guide member 4, It is necessary to press so that there is no gap between the light guide member 4. At this time, since the adhesive made of silicone is not completely adhered, the displacement of the positions of the light guide member 4 and the light source 3 can be absorbed by the connection member 5 rotating and tilting.

A modification of the first embodiment of the present invention will be described. FIG. 5 is a perspective view showing the base 2 of the linear light source device 1 according to a modification of the first embodiment.
In the base 2 shown in FIG. 5, not only the light source holding part 21 but also the light guide member holding part 22 is formed of metal instead of resin, and the light source holding part 21 and the light guide member holding part 22 are joined to each other. It is welded and formed as a single piece. Moreover, the fin 24 extended along the longitudinal direction of the light guide member holding part 22 is attached not to the light source holding part 21 but to the light guide member holding part 22.

  The light source holding part 21 is formed in an L shape by bending a metal plate. Moreover, since the light guide member holding part 22 has the same cross-sectional shape in the longitudinal direction, the light guide member holding part 22 is formed into a metal in the extrusion process. The light guide member 4 inserted inside is fixed by making the opening of the light guide member holding portion 22 slightly small. When the light guide member is inserted, the opening widens and is held by the elasticity of the metal.

  Even if the light guide member 4 and the light source 3 are fixed using the base 2 made of metal shown in FIG. 5, the center axis of the light guide member 4 and the optical axis of the light source 3 are shifted. However, the light source 3, the connection member 5, and the light guide member 4 can be disposed in close contact with each other by arranging the connection member 5 to be inclined in accordance with the positions of the light guide member 4 and the light source 3. And the light radiated | emitted from the light source 3 is prevented from leaking in the boundary surface with the connection member 5, and the boundary surface with the light guide member 4, and it takes in into the light guide member 4 via the connection member 5 efficiently. Can do.

A second embodiment of the present invention will be described. FIG. 6 is a diagram illustrating the linear light source device 1 according to the second embodiment. FIG. 6A is a perspective view illustrating the entire linear light source device 1, and FIG. 6B is an enlarged cross-sectional view of a connection portion of the light guide member 4, the connection member 5, and the light source 3.
The linear light source device 1 is formed by covering both ends of the light guide member 4 with sockets 25a and 25b. The light source 3 is disposed inside one socket 25 a and connects the light source 3 and the light guide member 4 via the connection member 5. Since the sockets 25a and 25b are formed so that the surface of one end is flat, the linear light source device 1 can be easily fixed. This configuration makes it easy to transfer heat from the light source to the outside from a flat surface, and further facilitates positioning as a linear light source.
In the linear light source device 1 whose both ends are covered with the sockets 25a and 25b, a member for holding or protecting the light guide member 4 can also be provided.

  As shown in FIG. 6B, the sockets 25a and 25b are made of a substantially cylindrical metal having a bottom, the substrate 32 of the light source 3 is fixed to the bottom surface 26, and the ring-shaped packing is disposed on the cylindrical surface 27. The light guide member 4 is fixed. Since the light source 3 is fixed inside the socket 25a and cannot be adjusted from the outside, the optical axis of the light source 3 is shifted as it is when the installation position is shifted. Further, since the light guide member 4 is only held by the ring-shaped packing, accurate positioning with respect to the light source 3 cannot be performed.

  Moreover, the light guide member 4, the connection member 5, and the light source 3 have the same shape as the linear light source device 1 shown in the first embodiment. The light capturing portion 42 that is a boundary surface between the light guide member 4 and the connection member 5 is a hemispherical curved surface, and the light guide member side end surface 51 that is a boundary surface between the connection member 5 and the light guide member 4 is light capture. A hemispherical curved surface corresponding to the hemispherical curved surface of the insertion portion 42 is formed. In addition, the radiation surface 31 serving as a boundary surface between the light source 3 and the connection member 5 is a hemispherical curved surface, and the light source side end surface 52 serving as the boundary surface between the connection member 5 and the light source 3 corresponds to the hemispherical curved surface of the radiation surface 31. It is a hemispherical curved surface.

  Since the connection member 5 slides like a hinge at the boundary surface between the light guide member 4 and the connection member 5 or at the boundary surface between the connection member 5 and the light source 3, the connection can be made without any gap. Therefore, even if the light guide member 4 and the light source 3 are displaced and fixed to the socket 25a, the connection member 5 and the light guide member 4 and the connection member 5 and the light source 3 are rotated by rotating the connection member 5 itself. Can be arranged closely so that no gap is generated. And the light radiated | emitted from the light source 3 is prevented from leaking in the boundary surface with the connection member 5, and the boundary surface with the light guide member 4, and it takes in into the light guide member 4 via the connection member 5 efficiently. Can do.

Then, the assembly method of the linear light source device 1 is demonstrated.
First, the light source 3 is fixed to the bottom surface 26 of the socket 25 a, then, an adhesive made of silicone is applied to the surface of the light source side end surface 52 of the connection member 5, and the connection member 5 is applied to the radiation surface 31 of the light source 3. The light source side end faces 52 are connected together. Subsequently, an adhesive made of silicone is applied to the surface of the light capturing portion 42 of the light guide member 4 so that the light guide member 4 is pushed toward the light source 3, and the light capturing portion 42 is connected to the connection member 5. The light guide member side end face 51 is connected to match. At this time, since the adhesive made of silicone is not completely adhered, the displacement of the positions of the light guide member 4 and the light source 3 can be absorbed by the connection member 5 rotating and tilting.

The schematic diagram for demonstrating the internal structure of the copying machine in which the linear light source device of this invention is integrated The perspective view which shows the structure of the linear light source device of this invention. The expanded sectional view which cut | disconnected the linear light source device of this invention to the axial direction The expanded sectional view which cut | disconnected the vicinity of the connection member of this invention along the axial direction of the light guide member The perspective view which shows the structure of the linear light source device of this invention. The figure which shows the structure of the linear light source device of this invention The perspective view which shows the structure of the conventional linear light source device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear light source device 2 Base 3 Light source 4 Light guide member 5 Connection member 21 Light source holding part 22 Light guide member holding part 31 Radiation surface 41 Light emission surface 42 Light taking-in part 51 Light guide member side end surface 52 Light source side end surface 53 Slope

Claims (7)

In a linear light source device in which a long light guide member having one end portion serving as a light capturing portion and a light source disposed so as to face the light capturing portion are fixed to a base ,
The light capturing portion of the light guide member has a curved surface that is rotationally symmetric about the central axis of the light guide member,
The emission surface of the light source is a rotationally symmetric curved surface around the central axis of the light source,
A connecting member is disposed between the light capturing portion of the light guide member and the radiation surface of the light source,
The boundary surface between the connecting member and the light guide member is a curved surface that is rotationally symmetric about the central axis of the connecting member,
A linear light source device, wherein a boundary surface of the connecting member with the light source is a curved surface that is rotationally symmetric about a central axis of the connecting member. A linear light source device in which a long light guide member having one end portion serving as a light capturing portion and a light source disposed so as to face the light capturing portion are fixed inside a socket. In
The light capturing portion of the light guide member has a curved surface that is rotationally symmetric about the central axis of the light guide member,
The emission surface of the light source is a rotationally symmetric curved surface around the central axis of the light source,
A connecting member is disposed between the light capturing portion of the light guide member and the radiation surface of the light source,
The boundary surface between the connecting member and the light guide member is a curved surface that is rotationally symmetric about the central axis of the connecting member,
A linear light source device, wherein a boundary surface of the connecting member with the light source is a curved surface that is rotationally symmetric about a central axis of the connecting member. The light capturing part of the light guide member has a hemispherical curved surface, the radiation surface of the light source has a hemispherical curved surface, and the boundary surface of the connection member with the light guide member and the connection member The linear light source device according to claim 1, wherein a boundary surface with the light source is a hemispherical curved surface. The light source whose radiation surface is a rotationally symmetric curved surface around the central axis is fixed to the base, and then the light source side end surface that becomes the interface with the light source and the light guide member side end surface that becomes the interface with the light guide member And a connecting member having a curved surface that is rotationally symmetric about the central axis is rotatably connected to the radiation surface of the light source, and finally, the light capturing portion at one end is rotationally symmetric about the central axis. An assembly method for a linear light source device, wherein a long light guide member having a curved surface is coupled to a connection member while being fixed to a base. A light guide member at one end is fixed to a base with a long light guide member having a curved surface that is rotationally symmetric about the central axis, and then a light source side end surface that serves as an interface with the light source, A connecting member having a curved surface that is rotationally symmetric about the central axis and a light guide member side end surface serving as an interface with the light guide member is rotatably connected to the light capturing portion of the light guide member, and finally, A method of assembling a linear light source device, characterized in that a light source whose radiation surface is a rotationally symmetric curved surface around a central axis is coupled to a connection member while being fixed to a base. 6. The method of assembling a linear light source device according to claim 4, wherein after the light source, the connection member, and the light guide member are connected, the light guide member is pressed in the axial direction toward the light source. 6. The method of assembling a linear light source device according to claim 4, wherein after the light source, the connection member, and the light guide member are coupled, the light source is pressed in the axial direction toward the light guide member.

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