JP5405525B2 - lamp - Google Patents

Description

  The present invention relates to a lamp, and particularly to a lamp that can be attached to a bicycle.

  In general, a bicycle has a lamp mounted on a frame. 2. Description of the Related Art Conventionally, bicycle lamps that are turned on / off according to ambient brightness are known (see, for example, Patent Document 1). In the conventional lamp, an opening for detecting illuminance is provided on the lower surface of the rear portion of the housing. An optical sensor is disposed inside the housing facing the opening. The optical sensor detects ambient illuminance. An on / off control circuit for turning on and off the light source of the lamp by an output of the optical sensor is provided in the housing. For example, the on / off control circuit is set to turn on the light source when the detected illuminance falls below a predetermined illuminance and to turn off the light source when the illuminance exceeds the predetermined illuminance. When an opening is formed in the rear lower surface of such a case, the illumination is affected by light that changes in a short time such as light from the front such as a car headlight or light from above such as a street light. It becomes difficult. This makes it difficult for the lamp to malfunction.

JP 2003-16810 A

  In the conventional configuration, it is difficult to be affected by light from above or from the front. However, bicycles are equipped with components that reflect light, such as mudguards, wheel rims, and frames. If reflected light from these components enters the opening from below, the detection result of the optical sensor may be affected. As a result, there is a possibility of affecting the on / off of the light source of the lamp.

  An object of the present invention is to reduce the influence of reflected light in a lamp that is turned on and off based on the illuminance of light incident from an opening.

The lamp according to the first aspect of the invention can be attached to a bicycle. The lamp includes a housing having an opening and an optical sensor. The optical sensor is configured to detect light in a predetermined light receiving region, and is disposed in the housing so as to receive light from the opening. The opening is provided so that a part of the light receiving region is blocked by the wall surface on which the opening of the housing is arranged .

  In the lamp that can be attached to the bicycle, an opening is provided so that a part of the light receiving region of the optical sensor is blocked by the housing. For this reason, when the opening is arranged in any direction when attached to the bicycle, when a bicycle component having a high reflectance is arranged in the arrangement direction of the opening, the reflected light from the bicycle component can be blocked. . Therefore, the influence of the reflected light can be reduced, and the light source of the lamp can be appropriately turned on / off.

  A lamp according to a second aspect of the present invention is the lamp according to the first aspect of the present invention, wherein when the lamp is attached to a bicycle, the opening is provided downward. In this case, the influence of reflected light can be reduced even if a highly reflective bicycle part such as a handlebar, mudguard, or wheel rim is disposed below the lamp.

  The lamp according to a third aspect is the lamp according to the first or second aspect, wherein the optical sensor is disposed so as to be inclined with respect to the opening in the housing. In this case, since a part of the light receiving region can be shielded by the housing simply by tilting the optical sensor with respect to the opening, the structure for shielding the light receiving region is simple.

  The lamp according to a fourth aspect of the present invention is the lamp according to the third aspect of the present invention, wherein the light sensor is disposed so as to be tilted to one of the left side and the right side of the bicycle with respect to the opening when attached to the bicycle. In this case, the tilt direction of the light sensor is not the front or rear side, but the left or right side of the bicycle. Can be reduced.

  A lamp according to a fifth aspect of the present invention is a lamp that can be attached to a bicycle. The lamp includes an optical sensor having a light receiving surface and a housing. The housing has an opening that houses the photosensor and is provided so that the light receiving surface of the photosensor receives light from the outside. The opening is provided so as to face downward when attached to the bicycle, and the optical sensor is inclined to one of the left and right sides of the bicycle with respect to the opening when attached to the bicycle. Be placed.

  According to the present invention, the influence of reflected light can be reduced, and the light source of the lamp can be appropriately turned on and off.

The side view which shows the front part of the bicycle with which the lamp | ramp by one Embodiment which concerns on this invention was mounted | worn. 1 is a side sectional view of a lamp according to an embodiment of the present invention. The top view of a lamp | ramp. IV-IV sectional drawing of FIG.

  In FIG. 1, a lamp 14 according to an embodiment of the present invention can be attached to a bicycle 101 and can irradiate the front of the bicycle. The frame 102 of the bicycle 101 has a front fork 102a to which a front wheel 106 can be attached. The front wheel 106 has a rim 106a made of metal such as aluminum having high light reflectivity. A mudguard 103 and a handle 104 are fixed to the front fork 102a. The handle 104 is a metal member made of aluminum or the like having a high light reflectance, and is fixed to the upper portion of the front fork 102a. The mudguard 103 is made of a metal such as aluminum having a high light reflectance, and is fixed to the hub shaft 10a of the hub dynamo 10 of the front wheel 106 and the front fork 102a. In this embodiment, the ramp 14 can be attached to a handle 104 that is fixed to the top of the front fork 102a. In the following description, the front and rear of the ramp 14 refers to the forward direction of the bicycle 101 with the ramp 14 attached to the bicycle 101, and the opposite is the rear. The left and right of the lamp 14 means the left and right when the bicycle 101 is viewed from the rear with the lamp 14 attached to the bicycle 101. Furthermore, the top and bottom of the lamp 14 are the top and bottom when the lamp 14 is attached to the bicycle.

  The lamp 14 is fixed to the handle 104 in the form of a band. 2, 3, and 4, the lamp 14 includes a main body 20, a lens member 22, a light source 24, an optical sensor 26, a reflecting member 28, and an on / off circuit 30 that controls on / off of the light source 24. Have.

  The main body 20 includes a band 32 that can be attached to the handle 104, and a housing 34 that is fixed to the band 32 and has a storage space 34a therein. The band 32 is made of a synthetic resin and has a fixing hole 32 a that can be fixed to the handle 104. A slit 32 b is formed in the fixing hole 32 a, and the lamp 14 can be fixed to the handle 104 by tightening the slit 32 b with the bolt member 33.

  The housing 34 is a member made of a polystyrene-based synthetic resin such as ABS (acrylonitrile butadiene styrene) resin. The housing 34 has a circular opening 40 formed on the lower surface on the right side from the center in the left-right direction. The lens member 22 is fixed to the front portion of the storage space 34 a of the housing 34. The light source 24 is disposed behind the lens member 22 in the storage space 34a. The light source 24 is supported by a light source support member 35 disposed inside the housing 34. A reflecting member 28 is disposed around the light source 24. An on / off circuit 30 is disposed behind the light source 24. The opening 40 is disposed on the wall surface of the housing 34 below the optical sensor 26. The opening 40 is covered with a transparent circular cover member 44.

  The lens member 22 is a convex lens attached to the main body 20. The lens member 22 is made of a synthetic resin having translucency such as a transparent acrylic resin or polycarbonate. The lens member 22 is fixed to the front surface of the housing 34 with screws.

  The light source 24 is disposed inside the main body 20. The light source 24 includes at least one light emitting diode (hereinafter referred to as LED (Light Emitting Diode)) 50. The LED 50 is, for example, a 3 W 700 mA high-intensity light emitting diode.

  The optical sensor 26 is disposed inside the housing 34 so as to receive light from the opening 40. The optical sensor 26 is an illuminance detection sensor for turning on and off the light source 24 according to the brightness around the lamp 14. The optical sensor 26 has a light receiving surface 26a. As the optical sensor 26, for example, a photo IC diode type photo sensor using an optical filter is used. The optical sensor 26 outputs an electrical signal that changes according to the detected illuminance (light quantity) of the light to the on / off circuit 30. The optical sensor 26 is configured to receive light in a predetermined light receiving area LA indicated by a two-dot chain line in FIGS. The light receiving area LA extends in a conical shape from the light receiving surface 26 a of the optical sensor 26.

  The reflection member 28 reflects the light from the light source 24 toward the lens member 22. The outer surface of the reflecting member 28 is plated. The reflecting member 28 is a member made of polystyrene-based synthetic resin such as ABS (acrylonitrile butadiene styrene) resin. The reflection member 28 is supported by the tip of the light source support member 35 and the lens member 22.

  The on / off circuit 30 performs on / off control of the light source 24 based on the detection result of the optical sensor 26. The on / off circuit 30 includes a circuit board 36 and an on / off control circuit 42 mounted on the circuit board 36. The on / off control circuit 42 is mounted on the upper surface of the circuit board 36. An optical sensor 26 is mounted on the lower right side of the lower surface of the circuit board 36.

  As shown in FIG. 4, the circuit board 36 is attached to a board attachment portion 34 b that is inclined leftward within the housing 34. Therefore, the circuit board 36, the optical sensor 26 mounted on the circuit board 36, and the on / off control circuit 42 are inclined leftward (counterclockwise as viewed from the rear). Since the optical sensor 26 is inclined to the left in this way, a part of the light receiving area LA of the optical sensor 26 indicated by two two-dot chain lines in FIG. The light receiving area LA1 between the broken line indicated by the left-down hatching and the two-dot chain line on the left side is shielded by the opening 40. The on / off control circuit 42 is electrically connected to one end of the hub dynamo 10 shown in FIG.

  In the lamp 14 configured as described above, the on / off control circuit 42 is turned on and the light source 24 is turned on when the illuminance around the nighttime, underpass, tunnel, or the like falls below the first illuminance L1. At this time, a part of the light receiving area LA1 of the light receiving area LA of the optical sensor 26 is shielded by the opening 40, and light from below the opening 40 is shielded. The light reflected from the component is limited, and the illuminance is reduced. For this reason, even if reflected light enters from a bicycle part, the influence of the reflected light can be reduced, and the light source 24 can be appropriately turned on and off. That is, the influence of external factors can be reduced as much as possible, and the on / off control of the light source 24 can be appropriately performed.

<Other embodiments>
The specific configuration of the present invention is not limited to the above-described embodiment, and various changes and modifications can be made without departing from the scope of the invention. In the following description of other embodiments, members that are not described are members similar to those of the above-described embodiment.

  (A) In the above-described embodiment, the circuit board 36 on which the optical sensor 26 is mounted is tilted to the left. However, the optical sensor is mounted on the circuit board so that the circuit board and the opening are parallel and tilted with respect to the opening. You may do it. Further, the optical sensor may be tilted to the right (clockwise as viewed from the rear) with respect to the opening. Further, the opening may be arranged to be inclined with respect to the optical sensor.

  (B) In the above-described embodiment, the lamp 14 that can be attached to the bicycle handle 104 is illustrated, but the attachment position of the lamp is not limited to the handle 104. For example, the present invention can be applied to a lamp disposed on a lamp stay of a front fork, a bicycle front basket, and a bicycle mudguard.

  (C) In the above embodiment, the present invention has been described by taking a bicycle lamp having an on / off circuit as an example. However, the present invention is not limited to this, and the on / off circuit may be separate from the lamp. Moreover, although the power is supplied from the dynamo, a lamp having a power source such as a battery inside may be used.

  (D) In the embodiment, the light emitting diode is exemplified as the light source. However, the light source is not limited to the light emitting diode, and any light source may be used. For example, the light source may be a light bulb or a fluorescent lamp.

  (E) In the above embodiment, the present invention has been described by taking the lamp for irradiating the front of the bicycle as an example, but the present invention is not limited to this. For example, the present invention can be applied to other lamps that can be attached to a bicycle such as a taillight that irradiates the rear of the bicycle.

14 lamp 26 light sensor 26a light receiving surface 34 housing 40 opening 101 bicycle LA light receiving area LA1 light receiving area to be shielded

Claims (5)

A lamp that can be attached to a bicycle,
A housing having an opening;
A light sensor configured to detect light in a predetermined light receiving region and disposed in the housing to receive light from the opening,
The opening is a lamp provided such that a part of the light receiving region is blocked by a wall surface on which the opening of the housing is disposed .   The lamp according to claim 1, wherein the opening is provided so as to face downward when attached to the bicycle.   The lamp according to claim 1, wherein the optical sensor is disposed so as to be inclined with respect to the opening in the housing.   4. The lamp according to claim 3, wherein the light sensor is disposed so as to be inclined to one of a left side and a right side of the bicycle with respect to the opening when attached to the bicycle. A lamp that can be attached to a bicycle,
An optical sensor having a light receiving surface;
A housing that houses the photosensor and has an opening provided so that the light receiving surface of the photosensor receives light from the outside, and the opening is directed downward when attached to the bicycle. The lamp is provided so that the light sensor is disposed so as to be inclined to one of a left side and a right side of the bicycle with respect to the opening when attached to the bicycle.

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