JP2022018285A - Lens unit - Google Patents

Abstract

To suppress the variation of a heating value of a heater, in a lens unit equipped with the heater energizing to a pattern of a conductor formed on a flexible printed circuit board to heat.SOLUTION: A lens unit 1 is equipped with a plurality of lenses aligned along an optical axis L, and a lens holder 2. A first lens L1 disposed on the most object side La, is equipped with an image side flange surface 13 surrounding an image side lens surface 12, and a heater wire 90 is disposed on a flexible printed circuit board 8 disposed on the image side flange surface 13. The heater wire 90 is equipped with a plurality of third folding portions 95. At manufacturing the lens unit 1, a resistance value of the heater wire 90 is measured about each individual body of the flexible printed circuit board 8, and when the measured value is different from a target value, a short-circuit conductive material 96 is adhered to the third folding portion 95 and short-circuits the heater wire 90 to bring the resistance value close to the target value.SELECTED DRAWING: Figure 6

Description

The present invention relates to a lens unit in which a plurality of lenses are arranged on an optical axis.

Patent Document 1 discloses a lens unit used in an optical instrument. The lens unit of Patent Document 1 includes a plurality of lenses arranged on the optical axis and a lens holder for holding the plurality of lenses. The lens holder is a molded product in which a lens barrel (lens lens barrel) and a case (front case) covering the lens barrel are integrally molded. The gap between the first lens located closest to the subject among the plurality of lenses and the lens barrel is sealed by an O-ring.

In the lens unit of Patent Document 1, a heater is arranged inside the lens unit in order to suppress the occurrence of dew condensation in the lens unit when used outdoors. The heater is a heating wire arranged on the surface of an annular flexible printed substrate (diameter plate) having thermal conductivity. By energizing the heating wire to generate heat, the temperature around the lens is raised.

Japanese Unexamined Patent Publication No. 2019-168509

When forming a heating wire on the surface of a flexible printed circuit board, a conductive material is laminated on the surface of the flexible printed circuit board to form a pattern in the shape of the heating wire. At that time, the thickness and length of the conductor pattern are set so that the required calorific value can be obtained. However, if the shape accuracy of the pattern is low, the resistance value of the pattern of the conductor varies, which leads to variations in the calorific value.

For example, as a method for inexpensively producing a pattern of a conductive material, a method of forming a film of the conductive material by photolithography and forming a pattern by wet etching is used, but in this method, the pattern shape varies greatly. As a result, there is a problem that the amount of heat generated by the heater differs depending on the individual lens unit, and the dew condensation removing ability varies.

In view of the above problems, an object of the present invention is to suppress variations in the amount of heat generated by the heater in a lens unit that uses a conductor pattern formed on a flexible printed circuit board as a heater.

In order to solve the above problems, the lens unit of the present invention accommodates the first lens closest to the object, the second lens arranged on the image side with respect to the first lens, and the first lens. It has a first accommodating portion, a lens holder including a second accommodating portion accommodating the second lens, and a flexible printed substrate including a heater, and the first lens is an object-side lens surface and an image-side lens. The flexible printed substrate includes a surface and an image-side flange surface surrounding the image-side lens surface, and the flexible printed substrate includes a flat surface portion along the image-side flange surface and a stretched portion extending radially outward, and the stretched portion. A feeding wire is arranged in the lens, a heater wire connected to the feeding wiring is arranged in the flat surface portion, and the heater wire includes a plurality of folded portions.

According to the present invention, since the first lens can be heated by the heater wire arranged on the flexible printed substrate, it is possible to suppress the deterioration of optical performance due to dew condensation inside the lens unit. Further, the heater wire is provided with a plurality of folded portions. Therefore, after manufacturing a flexible printed circuit board equipped with a heater wire, the resistance value of the heater wire is measured for each individual, and if it is different from the target value, the heater wire is short-circuited at the position of the folded portion to target the resistance value. Can approach the value. As a result, even when the shape accuracy of the length and thickness of the heater wire is low, it is possible to reduce the variation in the resistance value of the heater wire. Therefore, it is possible to reduce the variation in the amount of heat generated by the heater, and it is possible to reduce the variation in the dew condensation removing ability of the lens unit.

In the present invention, it is preferable that the short-circuiting conductive material adhered to the folded-back portion is provided, and the heater wire is short-circuited by the short-circuiting conductive material. For example, if a conductive paste or a conductive adhesive is used as the short-circuiting conductive material, the heater wire can be easily short-circuited. Therefore, the resistance value of the heater wire can be easily adjusted.

In the present invention, it is preferable that the plurality of folded portions are arranged along the edge of the flexible printed circuit board. In this way, the short-circuit conductive material can be easily attached to the target position and range. Therefore, the resistance value of the heater wire can be easily and accurately adjusted.

In the present invention, it is preferable that the flexible printed substrate includes a protruding portion that protrudes radially outward from the flat surface portion, and the folded portion is arranged on the protruding portion. In this way, the folded portion for adjusting the resistance value of the heater wire is less likely to interfere with the component (for example, the second lens and the lens holder) arranged on the image side of the first lens. If the folded portion of the heater wire is sandwiched between the first lens and other parts, a plurality of folded portions may be crushed and short-circuited. However, in this embodiment, the folded portion protrudes outward in the radial direction. Since it is arranged in, there is little possibility that multiple folded parts will be crushed and short-circuited. Further, the short-circuiting conductive material adhering to the folded-back portion is crushed and spreads in an unintended range, and there is little possibility that the heater wire is short-circuited at an unintended position. Therefore, the resistance value of the heater wire can be adjusted with high accuracy.

In the present invention, the flat surface portion is annular, the feeding wiring extends radially from the extending portion to the flat surface portion, and the heater wire is connected to the radially inner end portion of the feeding wiring. Is preferable. When the connection portion between the heater wire and the power feeding wiring is arranged in the radial direction in this way, the folded portion of the heater wire can be easily arranged in the radial direction. Therefore, it is easy to short-circuit the folded portion.

In the present invention, it is preferable that the flexible printed substrate includes an overcoat layer that covers the power feeding wiring and the heater wire, and the folded portion includes an exposed portion that is exposed from the overcoat layer. In this way, the heater wire can be protected by the overcoat layer. Further, since the folded portion is exposed, the heater wire can be short-circuited only by attaching the short-circuiting conductive material. Therefore, the resistance value of the heater wire can be easily adjusted.

In the present invention, the heater wire includes a heater thin wire connected to the folded portion, and the line width of the folded portion is larger than the line width of the heater thin wire. By doing so, there is little possibility that the folded portion will be broken.

In the present invention, the folded portion includes a first portion connected to the heater thin wire and a second portion protruding from the first portion, and the line width of the second portion is larger than the line width of the first portion. Is also preferable. In this way, the tip of the folded portion is easily short-circuited, so that the resistance value of the heater wire can be easily adjusted. Further, since the gap between the adjacent folded portions is narrow, there is little possibility that the short-circuiting cannot be performed due to the misalignment of the short-circuiting conductive material or the insufficient amount.

Next, in order to solve the above problems, the lens unit of the present invention includes a first lens closest to the object side, a second lens arranged on the image side with respect to the first lens, and the first lens. The first lens has a lens holder including a first accommodating portion for accommodating the second lens, a second accommodating portion for accommodating the second lens, and a flexible printed substrate including a heater. The flexible printed substrate includes an image-side lens surface and an image-side flange surface surrounding the image-side lens surface, and the flexible printed substrate includes a flat surface portion along the image-side flange surface and an extension portion extending radially outward. A feeding wire is arranged in the extension portion, and a heater wire connected to the feeding wiring and a short-circuit wiring are arranged in the flat surface portion.

According to the present invention, since the first lens can be heated by the heater wire arranged on the flexible printed substrate, it is possible to suppress the deterioration of optical performance due to dew condensation inside the lens unit. Further, on the flexible printed board, short-circuit wiring is arranged in addition to the heater wire. Therefore, when the resistance value of the heater wire is different from the target value, the resistance of the heater wire is obtained by connecting the short-circuit wiring and the heater wire, or by cutting either the heater wire or the short-circuit wiring. You can adjust the value. Therefore, even when the shape accuracy of the length and thickness of the heater wire is low, the variation in the resistance value of the heater wire can be reduced, and the variation in the calorific value of the heater can be reduced.

For example, a configuration including a short-circuit conductive material for connecting the short-circuit wiring and the heater wire can be adopted. For example, if a conductive paste or a conductive adhesive is used as the short-circuiting conductive material, the short-circuiting wiring and the heater wire can be easily short-circuited. Therefore, the resistance value of the heater wire can be easily adjusted.

Alternatively, it is possible to adopt a configuration in which a cut portion cut by a laser is provided in either the short-circuit wiring or the heater wire short-circuited by the short-circuit wiring. In this way, the resistance value of the heater wire can be adjusted by cutting either the heater wire or the short-circuit wiring.

In the present invention, the short-circuit wiring is preferably arranged on the edge of the flexible printed substrate. In this way, the short-circuit conductive material can be easily attached to the target position and range. Therefore, the resistance value of the heater wire can be easily and accurately adjusted.

According to the present invention, since the first lens can be heated by the heater wire arranged on the flexible printed substrate, it is possible to suppress the deterioration of optical performance due to dew condensation inside the lens unit. Further, the heater wire has a plurality of folded portions, or the heater wire and the short-circuit wiring are arranged on the flexible printed circuit board. Therefore, after manufacturing a flexible printed circuit board equipped with a heater wire, the resistance value of the heater wire is measured for each individual, and if it is different from the target value, the heater wire is short-circuited at the position of the folded portion to target the resistance value. Can approach the value. Alternatively, the resistance value of the heater wire can be brought closer to the target value by connecting the short-circuit wiring and the heater wire, or by cutting either the heater wire and the short-circuit wiring. As a result, even when the shape accuracy of the length and thickness of the heater wire is low, it is possible to reduce the variation in the resistance value of the heater wire. Therefore, the variation in the heat generation amount of the heater can be reduced, and the variation in the dew condensation removing ability of the lens unit can be reduced.

It is sectional drawing of the lens unit which concerns on embodiment of this invention. It is an exploded sectional perspective view of the lens unit of FIG. It is a perspective view of a lens holder. It is a plan view of a lens holder, and is a plan view of a lens unit from which a first lens and an O-ring are removed. It is a top view of the flexible printed circuit board. It is a partially enlarged view of a heater wire. It is a partially enlarged sectional view of a lens unit. It is a top view of the flexible printed circuit board in which the heater wire of the modification 1 was formed. It is a top view of the flexible printed board in which the heater wire and the short circuit wiring of the modification 2 are formed. It is a top view of the flexible printed board in which the heater wire and the short circuit wiring of the modification 3 were formed.

Hereinafter, embodiments of a lens unit to which the present invention is applied will be described with reference to the drawings.

(overall structure)
FIG. 1 is a cross-sectional view of the lens unit 1 according to the embodiment of the present invention. In FIG. 1, L is the optical axis of the lens unit 1. La is one side in the L direction of the optical axis and is the object side (subject side) of the lens unit 1. Lb is the other side in the optical axis L direction and is the image side of the lens unit 1. The lens unit 1 includes a plurality of lenses arranged in a row along the optical axis L, and a lens holder 2 for holding the plurality of lenses. The plurality of lenses include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. A light-shielding plate L7 is arranged between the second lens L2 and the third lens L3, and a diaphragm L8 is arranged between the third lens L3 and the fourth lens L4.

Of the plurality of lenses, the first lens L1 and the fourth lens L4 located closest to the object side La are glass lenses. The fourth lens L4 is arranged inside the lens holder 2 in a state of being fixed to the frame-shaped holder 3. The second lens L2, the third lens L3, the fifth lens L5, and the sixth lens L6 are plastic lenses. The sixth lens L6 and the fifth lens L5 located on the image side Lb form the junction lens L9. The number and configuration of lenses held in the lens holder 2 is not limited to the above number and configuration.

The lens holder 2 is made of resin. The lens holder 2 is a lens that surrounds the first accommodating portion 4 that holds the first lens L1, the second accommodating portion 5 that is arranged on the image side Lb of the first accommodating portion 4, and the outer peripheral side of the second accommodating portion 5. A case 6 is provided. The lens case 6 extends from the outer peripheral end of the first accommodating portion 4 to the image side Lb. The second accommodating portion 5 holds a second lens L2, a third lens L3, a fourth lens L4, and a junction lens L9 (fifth lens L5 and sixth lens L6).

FIG. 2 is an exploded cross-sectional perspective view of the lens unit 1 of FIG. FIG. 3 is a perspective view of the lens holder 2. 4A is a plan view of the lens holder 2, and FIG. 4B is a plan view of the lens unit 1 from which the first lens L1 and the O-ring 7 are removed. 3 and 4 are views in which the portion above the AA position (caulking portion 45) in FIG. 1 is not shown. As shown in FIGS. 1 and 2, the first lens L1 is arranged on the lens holder 2 with the inner peripheral surface of the first accommodating portion 4 as a reference. Further, a second lens L2, a third lens L3, a fourth lens L4, and a junction lens L9 (fifth lens L5 and sixth lens L6) are arranged with the inner peripheral surface of the second accommodating portion 5 as a reference.

The first lens L1 is positioned in the optical axis L direction with reference to the lens seat surface 40 formed on the bottom of the first accommodating portion 4. As shown in FIGS. 1 and 3, the bottom portion of the first accommodating portion 4 has an annular connecting portion 41 connected to the outer peripheral surface of the second accommodating portion 5 and an annular portion protruding toward the object side La on the outer peripheral side of the annular connecting portion 41. 42, and a peripheral wall portion 43 rising from the outer peripheral edge of the regulating portion 42 to the object side La.

As shown in FIGS. 3 and 4, the regulating portion 42 is provided with protruding portions slightly protruding from the annular end surface 44 facing the object side La at a plurality of positions, and the tip surface of each protruding portion is on the lens seat surface 40. It has become. In this embodiment, the lens bearing surfaces 40 are provided at four locations with a substantially angular interval about the optical axis L. The outer peripheral portion of the first lens L1 is in contact with the lens seat surface 40, and the first lens L1 is caulked and fixed by the caulking portion 45 provided at the tip of the peripheral wall portion 43. The gap between the first lens L1 and the first accommodating portion 4 is sealed by an O-ring 7.

As shown in FIGS. 1 and 2, the second accommodating portion 5 has a tubular portion 51 connected to the annular connection portion 41 of the first accommodating portion 4 and an end portion of an image-side Lb of the tubular portion 51 extending in the optical axis L direction. The bottom portion 52 provided in the above is provided. The second lens L2, the third lens L3, the fourth lens L4, and the junction lens L9 (fifth lens L5 and sixth lens L6) have a lens bearing surface 50 formed on the bottom portion 52 of the second accommodating portion 5 (FIG. 3. Positioned in the L direction of the optical axis with reference to (see FIG. 4A).

The bottom portion 52 of the second accommodating portion 5 is provided with protruding portions slightly protruding from the annular bottom surface 53 facing the object side La at a plurality of positions, and the tip surface of each protruding portion is a lens seat surface 50. As shown in FIG. 4A, in the present embodiment, the lens seating surfaces 50 are provided at three locations at substantially angular intervals about the optical axis L. Further, the second accommodating portion 5 includes a recess 54 recessed in the image side Lb at a predetermined depth on the inner peripheral side of the annular bottom surface 53, and a circular opening 55 provided in the center of the recess 54.

The bonded lens L9 is positioned in the optical axis L direction by abutting the outer peripheral portion of the fifth lens L5 on the lens bearing surface 50. The sixth lens L6 arranged on the image side Lb is housed inside the recess 54, but is not in contact with the inner surface of the recess 54 and is positioned in the optical axis L direction via the fifth lens L5. There is.

The fourth lens L4 located on the object side La of the bonded lens L9 is held by the holder 3, and the holder 3 abuts on the outer peripheral portion of the fifth lens L5 in the optical axis L direction. Further, the outer peripheral portion of the third lens L3 located on the object side La of the fourth lens L4 abuts on the outer peripheral portion of the holder 3 in the optical axis L direction via the diaphragm L8. Further, the outer peripheral portion of the second lens L2 located on the object side La of the third lens L3 abuts on the outer peripheral portion of the third lens L3 in the optical axis L direction via the light shielding plate L7. Therefore, the second lens L2, the third lens L3, and the fourth lens L4 are all positioned in the optical axis L direction with respect to the lens bearing surface 50. The second lens L2 is caulked and fixed by a caulking portion 56 provided at the end of the object-side La of the tubular portion 51.

(1st lens)
As shown in FIGS. 1 and 2, the first lens L1 has an object-side lens surface 11 convex on the object-side La, an image-side lens surface 12 concave on the object-side La, and an outer peripheral side of the image-side lens surface 12. An image-side flange surface 13 surrounding the image-side flange surface 13 and an annular step portion 14 recessed in the object-side La on the outer peripheral side of the image-side flange surface 13 are provided. The image-side flange surface 13 is an annular flat surface perpendicular to the optical axis L. An O-ring 7 is arranged on the annular step portion 14.

The image-side flange surface 13 is a light diffusion surface, and fine irregularities (textures) are formed on the entire surface. In this embodiment, the blackening film 15 is formed on the image-side flange surface 13. The blackening film 15 is formed, for example, by applying black ink. Since the first lens L1 diffuses light by fine irregularities (textures) and absorbs light by blackening, it is possible to suppress deterioration of optical performance due to ghosting. The blackening film 15 is formed on substantially the entire image-side flange surface 13.

(Flexible printed board)
As shown in FIGS. 1 and 2, the lens unit 1 includes a flexible printed substrate 8. The flexible printed substrate 8 extends radially outward from between the first lens L1 and the second lens L2, is bent at a substantially right angle, and is passed through a through hole 46 formed in the first accommodating portion 4 of the lens holder 2. , It is pulled out to the image side Lb of the lens holder 2.

FIG. 5 is a plan view of the flexible printed substrate 8. A power supply wiring 85 and a heater 9 are arranged on the flexible printed substrate 8. In this embodiment, the heat generating portion (heater 9) is arranged on the flexible printed substrate 8. The heater 9 is composed of a heater wire 90 (see FIG. 7) formed on the surface of the flexible printed substrate 8.

As shown in FIG. 5, the flexible printed substrate 8 has an annular flat surface portion 81 along the image side flange surface 13, a stretched portion 82 extending linearly from the flat surface portion 81 toward the outside in the radial direction, and a stretched portion 82. A projecting portion 83 protruding radially outward from the flat surface portion 81 is provided on both sides in the circumferential direction. The heater 9 is arranged on the flat surface portion 81 and the protruding portion 83. In FIG. 5, X is an axis line passing through the center P of the flat surface portion 81. The extending portion 82 extends in the X direction of the axis. The flexible printed substrate 8 and the heater 9 are configured to be line-symmetrical with respect to the axis X. The heater 9 is arranged in the first region B1 on one side with respect to the axis X and the second region B2 on the other side with respect to the axis X. The first region B1 and the second region B2 are arcuate regions extending from the connecting portion 86 to a position opposite to the connecting portion 86 in the radial direction.

More specifically, the protruding portion 83 includes a first protruding portion 83A arranged on one side in the circumferential direction of the stretched portion 82, and a second protruding portion 83B arranged on the other side in the circumferential direction of the stretched portion 82. .. The power supply wiring 85 includes a first power supply wiring 85A connected to one end of the heater wire 90 and a second power supply wiring 85B connected to the other end of the heater wire 90. One of the first feeding wiring 85A and the second feeding wiring 85B is connected to the positive electrode, and the other of the first feeding wiring 85A and the second feeding wiring 85B is connected to the negative electrode.

The flat surface portion 81 of the flexible printed substrate 8 includes a connecting portion 86 arranged radially inside the stretched portion 82, and arcuate portions 87 extending in the circumferential direction on both sides of the connecting portion 86 in the circumferential direction. The arc portion 87 is connected to the extending portion 82 via the connecting portion 86. The protruding portion 83 projects radially outward from the arc portion 87 on both sides of the connecting portion 86 in the circumferential direction.

The first power feeding wiring 85A and the second feeding wiring 85B extend substantially in parallel in the extending portion 82 and the connecting portion 86 in a state of being electrically insulated. The radial inner end of the first power supply wiring 85A and the second power supply wiring 85B is connected to the heater 9.

The flexible printed circuit board 8 includes a flexible substrate 80A made of a resin film such as polyimide, and a heater wire 90 and a power feeding wiring 85 are formed on the surface of the flexible substrate 80A by a conductive material such as Cu. An overcoat layer 80C covering the heater wire 90 and the power feeding wiring 85 is formed on the surface of the flexible substrate 80A. The overcoat layer 80C is formed on the flat surface portion 81 and the stretched portion 82, and is not formed on the protruding portion 83. Therefore, a part of the heater wire 90 is not covered by the overcoat layer 80C.

The flexible printed substrate 8 includes a first notch 88 in which a portion adjacent to the protrusion 83 in the circumferential direction is linearly cut inward in the radial direction. More specifically, the first notch 88 is provided at two locations, between the first protrusion 83A and the stretched portion 82, and between the second protrusion 83B and the stretched portion 82. By providing the first notch 88, the warp of the first protrusion 83A and the second protrusion 83B is suppressed. Further, the heater wire 90 and the power supply wiring 85 are unlikely to be short-circuited.

Further, the flexible printed substrate 8 includes a second notch portion 89 in which the inner peripheral edge of the connecting portion 86 is linearly cut out toward the outside in the radial direction. The second notch portion 89 is located substantially in the center of the extension portion 82 in the circumferential direction, and is arranged between the first power supply wiring 85A and the second power supply wiring 85B. By providing the second notch portion 89, the warp of the connecting portion 86 is suppressed, and the first power feeding wiring 85A and the second feeding wiring 85B are less likely to be short-circuited.

In this embodiment, the first notch 88 and the second notch 89 are used as adhesive coating grooves. When assembling the lens unit 1, the flexible printed substrate 8 is fixed to the image side flange surface 13 by the adhesives arranged in the first notch portion 88 and the second notch portion 89.

When the flat surface portion 81 of the flexible printed substrate 8 is fixed to the image side flange surface 13, the flat surface portion 81 is positioned so that the center of the image side flange surface 13 and the center of the flat surface portion 81 are aligned with each other. The shape of the flat surface portion 81 is set to a shape that is less likely to affect the optical performance of the lens unit 1. In this embodiment, the inner diameter D1 (see FIG. 2) of the flat surface portion 81 is larger than the inner diameter D2 (see FIG. 2) of the image side flange surface 13 by a predetermined dimension (for example, 0.4 mm). Therefore, there is little possibility that the inner peripheral edge of the flat surface portion 81 protrudes inside the image-side lens surface 12 and deteriorates the optical performance.

(Heater wire)
FIG. 6 is a partially enlarged view of the heater wire 90. 6 (a) is a partially enlarged view of the region D of FIG. 5, and FIG. 6 (b) is a partially enlarged view of the region E of FIG. The heater wire 90 is a continuous wire of one conductor, one end of which is connected to the first power feeding wiring 85A and the other end of which is connected to the second feeding wiring 85B. Hereinafter, the shape of the heater wire 90 arranged in the first region B1 on one side with respect to the axis X will be described. The heater wire 90 arranged in the second region B2 on the opposite side of the axis X has a shape symmetrical with respect to the heater wire 90 in the first region B1 with respect to the axis X.

As shown in FIGS. 6A and 6B, the heater wires 90 arranged in the first region B1 are folded back in the circumferential direction at both ends in the circumferential direction of the first region B1 and have a diameter. It extends in a bellows shape in the direction. The heater wire 90 includes an arc-shaped heater thin wire 91 extending in the circumferential direction and a folded portion 92 arranged at the end portion of the heater thin wire 91 in the circumferential direction. The plurality of thin heater wires 91 are arranged at regular intervals in the radial direction. As shown in FIG. 6A, the end of the CCW on one side in the circumferential direction of the heater thin wire 91 on the innermost peripheral side is connected to the inner end in the radial direction of the second power feeding wiring 85B. Further, the end of the other side CW of the heater thin wire 91 on the outermost peripheral side in the circumferential direction extends to the axis X and is connected to the heater thin wire 91 arranged on the outermost peripheral side of the second region B2.

The folded-back portion 92 includes a plurality of first folded-back portions 93 (see FIG. 6A) arranged at the end of one side CCW in the circumferential direction of the first region B1 and the other side in the circumferential direction of the first region B1. A plurality of second folded portions 94 (see FIG. 6B) arranged at the end of the CW and a plurality of third folded portions 95 arranged at the second protruding portion 83B are provided.

Of the plurality of thin heater wires 91, some of the thin heater wires 91 arranged radially inside extend to the connecting portion 86 and are connected to the first folded portion 93. The first folded-back portion 93 is arranged in a radial direction at a position adjacent to the second power feeding wiring 85B in the circumferential direction. Of the plurality of heater thin wires 91, the heater thin wire 91 arranged radially outside the heater thin wire 91 connected to the first folded portion 93 has a diameter at the other side CW in the circumferential direction from the first folded portion 93. It is connected to the third folded portion 95 extending outward in the direction. The plurality of third folded portions 95 are arranged in a row in the circumferential direction at the second protruding portion 83B. The second folded-back portions 94 are arranged in a radial direction at positions opposite to the connecting portion 86 in the radial direction. All the heater thin wires 91 except the heater thin wire 91 on the outermost peripheral side are connected to the second folded portion 94.

Two heater thin wires 91 extending substantially in parallel are connected to the first folded portion 93 and the second folded portion 94, respectively. As shown in the partially enlarged view of FIG. 6B, the line width W1 of the second folded portion 94 is larger than the line width W0 of the heater thin wire 91. Further, the line width of the first folded portion 93 is equal to the line width W1 of the second folded portion 94 and larger than the line width W0 of the heater thin wire 91. Therefore, the heater wire 90 is less likely to be broken at the folded position. In this embodiment, the line width W0 of the heater thin wire 91 is 30 μm, and the line width W1 of the first folded portion 93 and the second folded portion 94 is 120 μm.

As shown in FIG. 6A, the third folded-back portion 95 includes a first portion 951 connected to the two heater thin wires 91 and a second portion 952 extending radially outward from the tip of the first portion 951. The line width of the third folded portion 95 differs between the first portion 951 and the second portion 952, and the line width W3 of the second portion 952 is larger than the line width W2 of the first portion 951. In this embodiment, the line width W2 of the first portion 951 is 120 μm, and the line width W3 of the second portion 952 is 160 μm. The gap between the adjacent first portions 951 is 100 μm, and the gap between the adjacent second portions 952 is 50 μm.

At the time of manufacturing the lens unit 1, after the heater wire 90 is formed on the flexible printed substrate 8, the resistance value of the heater wire 90 is measured for each individual, and if the resistance value of the heater wire 90 is different from the target value, the folded portion The resistance value of the heater wire 90 is adjusted by short-circuiting the 92. Therefore, the heater wire 90 is formed in a shape including a plurality of folded portions 92. The plurality of folded portions 92 are arranged in a row. Therefore, by adhering the short-circuiting conductive material 96 between the adjacent folded-back portions 92, the heater wire 90 can be short-circuited at the position of the folded-back portion 92 to adjust the resistance value.

A part of the folded-back portion 92 includes an exposed portion 97 exposed from the overcoat layer 80C. Therefore, the heater wire 90 can be short-circuited by adhering the short-circuiting conductive material 96 to the exposed portion 97. As shown in FIGS. 5 and 6A, since the first protruding portion 83A and the second protruding portion 83B are not covered by the overcoat layer 80C, the second portion 952 of the third folded portion 95 is exposed. It has a part 97. Therefore, as shown in FIG. 6A, the heater wire 90 can be short-circuited by adhering the short-circuiting conductive material 96 between the adjacent exposed portions 97.

In this embodiment, the third folded portion 95 extends in the radial direction, and the exposed portions 97 are arranged in a row along the outer peripheral edge of the flexible printed substrate 8. Therefore, it is easy to attach the short-circuit conductive material 96 between the adjacent exposed portions 97. Further, as described above, in the third folded portion 95, the line width W3 of the second portion 952, which is the exposed portion 97, is large, and the gap between the adjacent exposed portions 97 is small. As described above, in this embodiment, the gap between the adjacent exposed portions 97 is 50 μm. Therefore, there is little possibility that the heater wire 90 cannot be short-circuited due to the misalignment of the short-circuit conductive material 96 or the insufficient amount of the short-circuit conductive material 96.

(Positioning of the first lens in the L direction of the optical axis)
FIG. 7 is a partially enlarged cross-sectional view of the lens unit 1 and is a view cut at the CC position of FIG. 4 (b). As shown in FIG. 7, the lens holder 2 includes a regulating portion 42 projecting from the bottom surface of the first accommodating portion 4 to the object-side La, and the image-side flange surface 13 of the first lens L1 is the regulating portion 42. It includes an outer peripheral region 13A that abuts on the lens seat surface 40 provided at the tip. Further, the image-side flange surface 13 includes an inner peripheral region 13B located on the inner peripheral side of the outer peripheral region 13A, and the flat surface portion 81 of the flexible printed substrate 8 is arranged in the inner peripheral region 13B.

When the first lens L1 is attached to the first accommodating portion 4, as shown in FIGS. 4 (b) and 7, the flat surface portion 81 arranged in the inner peripheral region 13B of the image-side flange surface 13 becomes the regulating portion 42. It is placed on the inner circumference side. Therefore, the flat surface portion 81 does not interfere with the regulation portion 42, and the flexible printed substrate 8 is not sandwiched between the first lens L1 and the lens holder 2. In the present embodiment, the position of the first lens L1 in the optical axis L direction is defined by the direct contact between the outer peripheral region 13A of the image side flange surface 13 and the lens seat surface 40.

As shown in FIG. 7, the flat surface portion 81 of the flexible printed substrate 8 extends radially outward from the caulking portion 56 that fixes the outer peripheral edge of the second lens L2. In this embodiment, the gap S in the optical axis L direction between the caulked portion 56 and the inner peripheral region 13B of the image side flange surface 13 is larger than the thickness of the flexible printed substrate 8. Therefore, the flat surface portion 81 does not interfere with the caulking portion 56, and the flexible printed substrate 8 is not sandwiched between the first lens L1 and the caulking portion 56.

(Counterbore)
As shown in FIGS. 2, 3, and 4, the first accommodating portion 4 includes a counterbore portion 47 recessed radially outward from the inner peripheral edge of the regulating portion 42. As shown in FIG. 4B, the stretched portion 82 and the protruding portion 83 of the flexible printed substrate 8 are arranged in the counterbore portion 47. Further, as shown in FIG. 2, the stretched portion 82 is bent toward the image side Lb while extending outward in the radial direction, and is inserted into the slit-shaped through hole 46 that opens in the bottom surface of the counterbore portion 47. Therefore, the stretched portion 82 and the protruding portion 83 do not interfere with the regulating portion 42. The stretched portion 82 may include a reinforcing plate 80B fixed to the flexible substrate 80A. When the reinforcing plate 80B is provided, the reinforcing plate 80B is arranged in the through hole 46.

As shown in FIGS. 1 and 2, the through hole 46 penetrates the bottom of the first accommodating portion 4 in the optical axis L direction, and is formed in the gap between the tubular portion 51 of the second accommodating portion 5 and the lens case 6. Communicating. The inner peripheral surface of the lens case 6 is recessed in a shape along the radial outer edge of the through hole 46. The stretched portion 82 inserted into the through hole 46 is pulled out to the image side Lb of the lens holder 2 through the gap between the inner peripheral surface of the lens case 6 and the outer peripheral surface of the tubular portion 51.

In the present embodiment, the stretched portion 82 is not fixed to the through hole 46, but an adhesive may be placed in the through hole 46 and the stretched portion 82 may be fixed to the through hole 46 by the adhesive. In this case, by forming irregularities on the inner peripheral surface of the through hole 46, the adhesive area can be increased and the fixing strength of the stretched portion 82 can be increased.

The regulating portion 42 includes an outer edge portion 48 extending in the circumferential direction on the radial outer side of the counterbore portion 47. The outer edge portion 48 is connected to the lens bearing surfaces 40 provided on both sides of the counterbore portion 47 in the circumferential direction. Therefore, in the present embodiment, the regulating portion 42 is annular as a whole and faces the outer peripheral edge of the first lens L1 on the entire circumference. Therefore, since the O-ring 7 arranged on the outer peripheral edge of the first lens L1 is supported by the regulating portion 42 all around, it is possible to prevent the O-ring 7 from falling inside the counterbore portion 47 and deteriorating the sealing property. Will be done.

(Main action and effect of this form)
As described above, the lens unit 1 of the present embodiment includes the first lens L1 located closest to the object side La, the second lens L2 arranged on the image side Lb with respect to the first lens L1, and the first lens L1. It has a first accommodating portion 4 for accommodating, a lens holder including a second accommodating portion 5 for accommodating a second lens L2, and a flexible printed substrate 8 including a heater. The first lens L1 includes an object-side lens surface 11, an image-side lens surface 12, and an image-side flange surface 13 that surrounds the image-side lens surface 12. The flexible printed substrate 8 includes a flat surface portion 81 along the image side flange surface 13 and a stretched portion 82 extending radially outward. The feeding wiring 85 is arranged in the extension portion 82, and the heater wire 90 connected to the feeding wiring 85 is arranged in the flat surface portion 81. The heater wire 90 includes a plurality of third folded portions 95 (folded portions).

In this embodiment, since the first lens L1 can be heated by the heater wire 90 arranged on the flexible printed substrate 8, it is possible to suppress the deterioration of optical performance due to dew condensation inside the lens unit 1. Further, the heater 9 arranged inside the lens unit 1 measures the resistance value of the heater wire 90 for each individual after manufacturing, and if it is different from the target value, the heater wire 90 is located at the position of the third folded portion 95. It is possible to perform adjustment work to bring the resistance value closer to the target value by short-circuiting. Therefore, even when the shape accuracy of the length and thickness of the heater wire 90 is low, the variation in the resistance value of the heater wire 90 can be reduced. Therefore, the variation in the calorific value of the heater 9 is small, and the variation in the dew condensation removing ability of the lens unit 1 is small.

For example, if the measurement result of the resistance value of the heater wire 90 deviates from the target value, the short-circuiting conductive material 96 is attached to a position where it contacts both of the adjacent third folded portions 95 to short-circuit the heater wire 90. Let me. As the short-circuit conductive material 96, a conductive paste or a conductive adhesive can be used. Therefore, the heater wire 90 can be easily short-circuited, and the resistance value of the heater wire 90 can be easily adjusted.

If the measurement result of the resistance value of the heater wire 90 does not deviate from the target value, it is not necessary to short-circuit the heater wire 90. Therefore, in this case, the flexible printed circuit board 8 may be used in a state where the short-circuit conductive material 96 is not attached to the third folded-back portion 95.

In this embodiment, since the plurality of third folded portions 95 are lined up along the edge of the protruding portion 83 of the flexible printed substrate 8, it is easy to attach the short-circuit conductive material 96 to the target position. Further, even if the short-circuit conductive material 96 protrudes from between the third folded portions 95, there is little possibility that the short-circuit conductive material 96 adheres to a portion other than the portion to be short-circuited. Therefore, the resistance value of the heater wire 90 can be easily and accurately adjusted.

In the present embodiment, the flexible printed substrate 8 is provided with a protruding portion 83 projecting radially outward from the flat surface portion 81, and the third folded portion 95 is arranged on the protruding portion 83. Therefore, since the third folded portion 95 can be arranged radially outside, the second lens L2 arranged on the image side of the first lens L1 and the caulking portion 56 for caulking and fixing the outer peripheral edge of the second lens L2 are provided. Parts such as the lens holder 2 are unlikely to interfere with the third folded portion 95. Therefore, since the third folded portion 95 is less likely to be pinched and crushed between the first lens L1 and other parts, the third folded portion 95 is formed even though the short-circuit conductive material 96 is not attached. There is little risk of short circuit. Further, when the short-circuit conductive material 96 is attached, the short-circuit conductive material 96 is crushed and spreads in an unintended range, and there is little possibility that the heater wire 90 is short-circuited at an unintended position. Therefore, the resistance value of the heater wire 90 can be adjusted with high accuracy.

In the flexible printed substrate 8 of this embodiment, the flat surface portion 81 on which the heater 9 is arranged is annular, and the first power feeding wiring 85A and the second feeding wiring 85B extend radially from the extending portion 82 to the flat surface portion 81. .. The heater wire 90 is connected to the radially inner ends of the first power feeding wiring 85A and the second feeding wiring 85B. In this way, when arranging one heater wire 90 on the flat surface portion 81, the start point and the end point of the heater wire 90 (the portion connected to the first power supply wiring 85A and the second power supply wiring 85B) are arranged radially inside. If this is the case, it is easy to arrange the third folded-back portion 95 on the outer side in the radial direction. Therefore, it is easy to short-circuit the third folded portion 95.

In this embodiment, the flexible printed substrate 8 includes the power supply wiring 85 and the overcoat layer 80C that covers the heater wire 90, so that the heater wire 90 can be protected. The overcoat layer 80C is formed on the flat surface portion 81 and the stretched portion 82, and is not formed on the protruding portion 83. Therefore, since the third folded portion 95 arranged in the protruding portion 83 includes the exposed portion 97 exposed from the overcoat layer 80C, the heater wire 90 is short-circuited only by attaching the short-circuiting conductive material 96 to the exposed portion 97. be able to.

In the heater wire 90 of the present embodiment, the line width of the folded portion 92 is larger than the line width W0 of the heater thin wire 91. That is, the line width W1 of the first folded portion 93 and the second folded portion 94, and the line widths W2 and W3 of the third folded portion 95 are both larger than the line width W0 of the heater thin wire 91. Therefore, there is little possibility that the heater wire 90 will be disconnected at the folded position.

In the present embodiment, the third folded portion 95 of the heater wire 90 includes a first portion 951 connected to the heater wire and a second portion 952 protruding from the first portion 951, and the line width W3 of the second portion 952 is the first. It is larger than the line width W2 of one portion 951. Therefore, since the third folded portion 95 has a large line width on the tip side, it is easy to short-circuit. Further, since the gap between the adjacent third folded portions 95 is narrow, there is little possibility that the short-circuiting conductive material 96 cannot be short-circuited due to misalignment or insufficient amount.

The configuration in which the resistance value can be adjusted by short-circuiting the heater wire 90 is not limited to the above embodiment. For example, the configuration of Modifications 1-3 described below can be adopted.

(Modification 1)
FIG. 8 is a plan view of the flexible printed substrate 8 on which the heater wire 190 of the modified example 1 is formed. The heater 9 of the first modification includes a heater wire 190 arranged on the flat surface portion 81 of the flexible printed substrate 8. The heater wire 190 includes a plurality of heater wire portions 190A arranged in the circumferential direction. Each heater wire portion 190A includes an arcuate thin heater wire 191 extending in the circumferential direction, a folded portion 192 connected to the circumferential end of the thin heater wire 191 and a straight portion 193 extending in the radial direction. The plurality of heater thin wires 191 arranged at regular intervals in the radial direction are folded back to the opposite sides in the circumferential direction by the folded-back portion 192, and extend in a bellows shape in the radial direction. The straight line portion 193 connects the heater wire portions 190A adjacent to each other in the circumferential direction.

In the flexible printed substrate 8 of the first modification, the heater wire 190 is exposed because the overcoat layer is not provided in the arrangement region of the heater wire 190. Therefore, as shown in FIG. 8, by adhering the short-circuiting conductive material 196 to the folded-back portion 192 of each heater wire portion 190A, the adjacent heater wire portions 190A can be short-circuited in the circumferential direction. In the example shown in FIG. 8, two places are short-circuited, but the position and number of short-circuiting may be appropriately selected according to the resistance value.

As shown in FIG. 8, in the first modification, the first power supply wiring 85A and the second power supply wiring 85B extend substantially in parallel in the stretched portion 82 of the flexible printed substrate 8 in a state of being electrically insulated, and are connected to each other. In the portion 86, it extends to the opposite side in the circumferential direction. The first power feeding wiring 85A extending to one side in the circumferential direction is connected to one end of the heater wire 190. Further, the second power feeding wiring 85B extending to the other side in the circumferential direction is connected to the other end of the heater wire 190.

Since the heater wire 190 of the first modification can heat the first lens L1 in the same manner as in the above embodiment, it is possible to suppress the deterioration of optical performance due to dew condensation inside the lens unit 1. Further, the heater wire 190 includes a folded-back portion 192. Therefore, the resistance value of the heater wire 190 can be measured for each individual after production, and if it is different from the target value, the heater wire 190 can be short-circuited at the position of the folded-back portion 192 to bring the resistance value closer to the target value. As a result, the heater 9 provided with the short-circuiting conductive material 196 that short-circuits the heater wire 190 is obtained. Alternatively, when it is not necessary to adjust the resistance value, the heater wire 190 may be used as it is as the heater 9 without short-circuiting. Therefore, even when the shape accuracy of the length and thickness of the heater wire 190 is low, the variation in the resistance value of the heater wire 190 can be reduced. Therefore, it is possible to reduce the variation in the amount of heat generated by the heater 9, and it is possible to reduce the variation in the dew condensation removing ability of the lens unit 1.

(Modification 2)
FIG. 9 is a plan view of the flexible printed circuit board 8 in which the heater wire 290 and the short-circuit wiring 200 of the modification 2 are formed. The heater 9 of the modification 2 includes a heater wire 290 and a short-circuit wiring 200 arranged on the flat surface portion 81 of the flexible printed substrate 8. The heater wire 290 has substantially the same shape as the heater wire 190 of the first modification, and includes a heater thin wire 291 extending in the circumferential direction, a folded portion 292, and a straight portion 293 extending in the radial direction. One end of the heater wire 290 is connected to the first power feeding wiring 85A, and the other end is connected to the second feeding wiring 85B.

The short-circuit wiring 200 extends in the circumferential direction along the outer peripheral edge of the flat surface portion 81. The short-circuit wiring 200 is arranged radially outside the heater wire 290 and is separated from the heater wire 290. The short-circuit wiring 200 is an electrically independent dummy wiring, and is not electrically connected to the first feeding wiring 85A and the second feeding wiring 85B.

Since the flexible printed substrate 8 of the second modification does not have an overcoat layer in the arrangement region of the heater wire 290 and the short-circuit wiring 200, the heater wire 290 and the short-circuit wiring 200 are exposed. Therefore, as shown in FIG. 9, the short-circuit wiring 200 and the heater wire 290 can be connected at two places by the short-circuit conductive material 296 attached to the short-circuit wiring 200, and the heater wire 290 can be short-circuited. .. The position for short-circuiting may be appropriately selected according to the resistance value. In this embodiment, the distance W4 between the short-circuit wiring 200 and the heater thin wire 291 located on the outermost side in the radial direction is smaller than the distance W5 between the heater thin wires 291 adjacent to each other in the radial direction. Therefore, it is easy to short-circuit the short-circuit wiring 200 and the heater wire 290, and there is little possibility that the short-circuiting conductive material 296 cannot be short-circuited due to a deviation in the adhesion position or a variation in the adhesion amount.

Since the heater wire 290 of the second modification can heat the first lens L1 in the same manner as in the above embodiment, it is possible to prevent dew condensation inside the lens unit 1 from deteriorating the optical performance. Further, in the second modification, the heater wire 290 and the short-circuit wiring 200 are arranged on the flat surface portion 81 of the flexible printed substrate 8. Therefore, the resistance value of the heater wire 290 is measured for each individual after manufacturing, and if it is different from the target value, the short-circuit wiring 200 and the heater wire 290 are connected to short-circuit the heater wire 290 and the resistance value. Can be brought closer to the target value. As a result, even when the shape accuracy of the length and thickness of the heater wire 290 is low, the variation in the resistance value of the heater wire 290 can be reduced. Therefore, it is possible to reduce the variation in the amount of heat generated by the heater 9, and it is possible to reduce the variation in the dew condensation removing ability of the lens unit 1.

In the embodiment shown in FIG. 9, the short-circuit wiring 200 is not connected to the first power supply wiring 85A and the second power supply wiring 85B, but the short-circuit wiring 200 is connected to the first power supply wiring 85A or the second power supply wiring 85B. You may keep it connected to. As a result, the heater wire 290 can be short-circuited only by arranging the short-circuit conductive material 296 at one place.

(Modification 3)
FIG. 10 is a plan view of the flexible printed circuit board 8 on which the heater wire 390 and the short-circuit wiring 300 of the modified example 3 are formed. The heater 9 of the modification 3 includes a heater wire 390 and a short-circuit wiring 300 arranged on the flat surface portion 81 of the flexible printed substrate 8. The heater wire 390 has substantially the same shape as the heater wire 190 of the first modification, and includes a heater thin wire 391 extending in the circumferential direction, a folded portion 392, and a straight portion 393. The heater thin wire 391 and the folded portion 392 are connected in a bellows shape. One end of the heater wire 390 is connected to the first power feeding wiring 85A, and the other end is connected to the second feeding wiring 85B.

In the third modification, the thin heater wire 391, the folded portion 392, and the straight portion 393 form the heater wire portion 390A, and the heater wire 390 includes a plurality of heater wire portions 390A arranged in the circumferential direction. The short-circuit wiring 300 extends in the circumferential direction along the outer peripheral edge of the flat surface portion 81, and is arranged outside the radial direction of the heater wire 390. The short-circuit wiring 300 is arranged at six locations separated in the circumferential direction. Each short-circuit wiring 300 connects adjacent heater wire portions 390A. That is, the heater wire 390 is in a state of being short-circuited at six places by the six short-circuit wirings 300.

Since the heater wire 390 of the modification 3 can heat the first lens L1 in the same manner as in the above embodiment, it is possible to suppress the deterioration of optical performance due to dew condensation inside the lens unit 1. Further, after manufacturing, the resistance value of the heater wire 390 is measured for each individual, and if the measurement result is different from the target value, either the short-circuit wiring 300 or the heater wire portion 390A is cut by a laser to cut the heater wire. The resistance value of 390 can be brought close to the target value. The heater 9 after adjusting the resistance value is provided with a cut portion cut by a laser in either the short-circuit wiring 300 or the heater wire 390 short-circuited by the short-circuit wiring 300.

The cutting position Q1 when cutting the short-circuit wiring 300 and the cutting position Q2 when cutting the heater wire portion 390A can be, for example, the positions shown in FIG. If the cutting position Q2 of the heater wire portion 390A is set to the heater thin wire 391 on the innermost peripheral side, it is easy to cut at an accurate position, and there is little possibility of accidentally cutting another portion. Further, since the short-circuit wiring 300 extends along the outer peripheral edge of the flat surface portion 81, it is easy to cut at an accurate position, and there is little possibility of accidentally cutting another portion.

In the third modification, the resistance value can be adjusted by short-circuiting the heater wire 390 with the short-circuit wiring 300 in advance and cutting the heater wire 390 or the short-circuit wiring 300 as described above. Therefore, even when the shape accuracy of the length and thickness of the heater wire 390 is low, it is possible to reduce the variation in the resistance value of the heater wire 390 by adjusting the resistance value. Therefore, it is possible to reduce the variation in the amount of heat generated by the heater 9, and it is possible to reduce the variation in the dew condensation removing ability of the lens unit 1.

(Other variants)
A transparent conductive film that functions as a heater may be provided on the image-side lens surface 12 of the first lens L1, and a configuration may be adopted in which power is supplied to the transparent conductive film from an electrode formed on the flexible printed substrate. By doing so, the first lens L1 can be heated by the heater wire 90 and the transparent conductive film, so that the dew condensation removing ability can be enhanced.

1 ... lens unit, 2 ... lens holder, 3 ... holder, 4 ... first housing, 5 ... second housing, 6 ... lens case, 7 ... O-ring, 8 ... flexible printed board, 9 ... heater, 11 ... Object side lens surface, 12 ... image side lens surface, 13 ... image side flange surface, 13A ... outer peripheral region, 13B ... inner peripheral region, 14 ... annular step portion, 15 ... blackened film, 40 ... lens seat surface, 41 ... Circular connection part, 42 ... Restriction part, 43 ... Circumferential wall part, 44 ... Circular end face, 45 ... Caulking part, 46 ... Through hole, 47 ... Counterbore part, 48 ... Outer edge part, 50 ... Lens seat surface, 51 ... Cylindrical part, 52 ... bottom, 53 ... annular bottom surface, 54 ... recess, 55 ... opening, 56 ... caulking part, 80A ... flexible substrate, 80B ... reinforcing plate, 80C ... overcoat layer, 81 ... flat part, 82 ... stretched part , 83 ... projecting portion, 83A ... first protruding portion, 83B ... second projecting portion, 85 ... feeding wiring, 85A ... first feeding wiring, 85B ... second feeding wiring, 86 ... connecting portion, 87 ... arc portion, 88. ... 1st notch, 89 ... 2nd notch, 90 ... heater wire, 91 ... heater thin wire, 92 ... folded part, 93 ... 1st folded part, 94 ... 2nd folded part, 95 ... 3rd folded part , 96 ... Conductive material for short circuit, 97 ... Exposed part, 190, 290, 390 ... Heater wire, 190A, 390A ... Heater wire part, 191, 291, 391
... Heater thin wire, 192, 292, 392 ... Folded part, 193, 293, 393 ... Straight part, 196, 296 ... Short-circuit conductive material, 200, 300 ... Short-circuit wiring, 951 ... First part, 952 ... Second part , B1 ... 1st region, B2 ... 2nd region, CCW ... one side in the circumferential direction, CW ... the other side in the circumferential direction, L ... optical axis, La ... object side, Lb ... image side, L1 ... first lens, L2 ... 3rd lens L3 ... 3rd lens, L4 ... 4th lens, L5 ... 5th lens, L6 ... 6th lens, L7 ... shading plate, L8 ... aperture, L9 ... junction lens, P ... center of flat surface, Q1, Q2 ... cutting position, S ... gap

Claims (12)

The first lens on the most object side and
A second lens arranged on the image side with respect to the first lens,
A lens holder including a first accommodating portion for accommodating the first lens and a second accommodating portion for accommodating the second lens.
With a flexible printed circuit board equipped with a heater,
The first lens includes an object-side lens surface, an image-side lens surface, and an image-side flange surface that surrounds the image-side lens surface.
The flexible printed substrate includes a flat surface portion along the image-side flange surface and a stretched portion extending radially outward.
A power supply wiring is arranged in the extension portion.
A heater wire connected to the power feeding wiring is arranged on the flat surface portion.
The heater wire is a lens unit including a plurality of folded portions. The lens unit according to claim 1, wherein the plurality of folded portions are arranged along the edge of the flexible printed circuit board. The flexible printed substrate includes a protrusion that protrudes radially outward from the flat surface portion.
The lens unit according to claim 1 or 2, wherein the folded portion is arranged on the protruding portion. A short-circuit conductive material adhering to the folded portion is provided.
The lens unit according to any one of claims 1 to 3, wherein the heater wire is short-circuited by the short-circuiting conductive material. The flat surface portion is annular and has an annular shape.
The power feeding wiring extends radially from the extending portion to the flat surface portion.
The lens unit according to any one of claims 1 to 4, wherein the heater wire is connected to an end portion on the inner side in the radial direction of the power feeding wiring. The flexible printed substrate includes an overcoat layer that covers the power feeding wiring and the heater wire.
The lens unit according to any one of claims 1 to 5, wherein the folded portion includes an exposed portion exposed from the overcoat layer. The heater wire includes a thin heater wire connected to the folded portion.
The lens unit according to any one of claims 1 to 6, wherein the line width of the folded portion is larger than the line width of the heater thin wire. The folded portion includes a first portion connected to the heater wire and a second portion protruding from the first portion.
The lens unit according to claim 7, wherein the line width of the second portion is larger than the line width of the first portion. The first lens on the most object side and
The second lens arranged on the image side with respect to the first lens and
A lens holder including a first accommodating portion for accommodating the first lens and a second accommodating portion for accommodating the second lens.
With a flexible printed circuit board equipped with a heater,
The first lens includes an object-side lens surface, an image-side lens surface, and an image-side flange surface that surrounds the image-side lens surface.
The flexible printed substrate includes a flat surface portion along the image-side flange surface and a stretched portion extending radially outward.
A power supply wiring is arranged in the extension portion.
A lens unit characterized in that a heater wire connected to the power feeding wiring and a short-circuit wiring are arranged on the flat surface portion. The lens unit according to claim 9, further comprising a short-circuit conductive material for connecting the short-circuit wiring and the heater wire. The lens unit according to claim 9, wherein a cut portion cut by a laser is provided in either the short-circuit wiring or the heater wire short-circuited by the short-circuit wiring. The lens unit according to any one of claims 9 to 11, wherein the short-circuit wiring is arranged on the edge of the flexible printed substrate.

Images