WO2015178472A1

WO2015178472A1 - Light pointer

Info

Publication number: WO2015178472A1
Application number: PCT/JP2015/064706
Authority: WO
Inventors: 山本　正男
Original assignee: スカラ株式会社
Priority date: 2014-05-23
Filing date: 2015-05-22
Publication date: 2015-11-26
Also published as: JP2015222340A; JP6363396B2

Abstract

A device that can perform the function of a laser pointer but is safer than a laser pointer is provided. This light pointer has a first lens (150), a second lens (160), and a light-source system (140) that, in effect, functions as a point light source. The light-source system (140) is either an LED or an EL element and does not use a laser. Light leaving the light-source system (140) passes through the second lens (160), which has a negative power, increasing the beam angle of said light. Said light then heads towards and passes through the first lens (150), which has a positive power, and becomes, in effect, collimated light, which hits a prescribed target object and forms a light spot similar to the light spot formed by a laser pointer.

Description

Light pointer

The present invention relates to an optical pointer.

For example, there is a product called a laser pointer that is often used instead of a pointer in the presentation.
The laser pointer generally incorporates a laser oscillation device that oscillates a laser that is a semiconductor laser. As is well known, lasers have a very straight line. Applying it, the laser pointer functions as a pointer instead by making a light spot at the intended location by hitting the object pointing to the light that goes straight.
The laser pointer is easy to understand even in dark places, can be pointed at long distances where the pointer does not reach, and can be touched directly with a hand or pointer, such as extremely hot / cold or rotating There is an advantage that even if it is not present, it can be pointed by the light spot, and it is widely used.

On the other hand, it is pointed out that the laser pointer is dangerous. As described above, the laser pointer is an application of a laser having very high straightness. Although the high degree of straightness of the laser is indispensable for the laser pointer, there is a risk that an accident may occur depending on the magnitude of the laser output.
For example, if a laser emitted from a laser pointer in an unintentional direction by a malicious or malicious object enters the eyes of a third party, an unexpected situation may occur.

The danger of such a laser pointer has been pointed out for a long time, and measures such as regulation of the output of the laser oscillation device possessed by the laser pointer are taken by administrative guidance or industry self-regulation.
However, if the output of the laser oscillation device is weakened, the advantage of the laser pointer that the place shown even in a dark place is easily understood and that the pointer can be pointed at a long distance where the pointer does not reach is reduced. However, if the output of the laser oscillation device is strong, the danger cannot be suppressed.

The present invention is easy to understand even in a dark place, can be pointed at a long distance where the pointer does not reach, it can not be touched directly with the hand or pointer, such as extremely hot or cold or rotating It is an object of the present invention to contribute to providing an apparatus having a function that the laser pointer has such that even a thing can be pointed out and having less danger than the laser pointer.

The inventor of the present application has conducted research to solve the above-mentioned problems, and has developed a pointer based on the following completely new principle that does not use the above-described laser oscillation device such as the laser pointer or a laser oscillated therefrom.
The following devices, which are pointers that do not use a laser, do not have the same type of device and the same type of product. Therefore, for convenience, the device will be referred to as an “optical pointer” in the present application.

The present invention relates to a first lens that is a lens having a positive power, and the extent that light emitted from the range on the optical axis of the first lens becomes practically parallel light after passing through the first lens. A light source system configured to irradiate light toward the first lens from a light emission range that is a narrow range, and the light becomes an actual parallel light that hits a predetermined object. It is a light pointer in which light creates a light spot.
This optical pointer does not use a laser. The light source system emits light, but the light emitted from the light source system is not a laser. The light source system includes, for example, an LED (Light Emitting Diode) or an EL (Electro Luminescence).
The optical pointer of the present application includes a first lens that is a lens having positive power. The light source system in this optical pointer irradiates light toward the first lens from a light emission range which is a narrow range in which light emitted therefrom passes through the first lens and becomes actual parallel light. It is like that. The first lens may be a plurality of lenses as long as it has a positive power when combined and considered. When the first lens is a single lens having positive power, the above-described light emission range coincides with the focal point of the first lens.
The fact that light coming out of a point light source focused on a lens having a positive power and entering the lens becomes parallel light exits the lens. is there. The optical pointer of the present application applies the principle to make the light emission range of the light source system so narrow that it actually functions as a point light source. The light emission range of the light source system is a range on the optical axis of the first lens, where the light emitted therefrom becomes the actual parallel light after passing through the first lens (the first lens has one positive power) In the case of a lens, it is positioned at the focal point of the first lens to obtain actual parallel light.
As a result, the light that is actually collimated light that hits the predetermined object sets the light spot on the object regardless of the distance from the optical pointer (more precisely, the first lens) to the object. Since it is made, this optical pointer can be used in the same manner as a laser pointer. In addition, since this optical pointer does not use a laser, there is almost no danger associated with the laser pointer.

The reason why such an optical pointer could not be made in the past is that a light source system that is practically narrow and sufficiently bright to function as a point light source has not existed in the past. When creating parallel light using a lens with a positive power, the size of the cross-section of the parallel light is a light emission range in which light is irradiated (for example, a planar light emitting surface that emits light is used as a light source). If the system has a light emitting surface, it corresponds to the light emission range. Moreover, since the light emission range cannot be an accurate point, the parallel light that has passed through the first lens is actually parallel light, but is not completely parallel light. Roughly speaking, the cross section of the light that has passed through the first lens increases as the distance to the object increases, and the light spot formed when it hits the object becomes larger and darker. Therefore, an optical pointer as in the present application cannot be made unless there is a light source system having sufficient brightness and a small light emission range.
The present invention not only finds such a light source system, including how to configure the light source system, but also creates actual parallel light using the light source system. It's worth it to make it clear that you can get supplies.
In this application, the light spot created on the object by the light exiting the first lens can be used in the same manner as the light spot created on the object by the light emitted from the laser pointer. When the light exiting the first lens is parallel, the condition of “actual parallel light” in the present application is satisfied.

The light emission range in the optical pointer of the present invention is preferably as small as possible, and may be smaller than 5 mm square, for example. The light emission range is on the optical axis of the first lens and is usually in a predetermined plane orthogonal to the optical axis of the first lens. When the light emission range is smaller than 5 mm square, the size of the light spot that can be obtained by applying parallel light to the object when the distance from the optical pointer to the object is about 3 m is smaller than 30 mm square (shape) The basic performance required to use the optical pointer like a laser pointer can be easily satisfied. In many cases, the light spot created by the laser pointer is, for example, a circle with a diameter of about several millimeters, and is usually relatively small. Here, the light spot produced by the laser pointer is small because it is a result derived from the fact that the irradiated light is a laser and that the output of the laser oscillator is practically limited mainly for safety reasons. However, the laser pointer manufacturer does not actively or intentionally reduce the light spot produced by the laser pointer. According to the study of the present inventor, it has been found that a light spot with a somewhat larger light spot is easier to see, for example, a circle with a diameter of 5 mm, more preferably a circle with a diameter of more than 10 mm. In that sense, it can be said that it is rather preferable that the size of the light spot when it is 3 m away from the optical pointer is about 30 mm square. Note that the light spot created by the actual parallel light on the object increases based on the fact that the cross-section of the actual parallel light increases as the distance from the light pointer to the object increases. If the parallel light can be brought closer to perfect parallel light, the light spot that the optical pointer creates on the object is completely the same regardless of the distance from the optical pointer to the light spot. Although this is in balance with the design of the optical system including the first lens, according to the study of the present inventor, the size of the light spot that the optical pointer creates on the object regardless of the distance from the laser pointer to the object. In order to achieve a certain degree of tolerance for the user, the light emission range is preferably smaller than 3 mm square, and more preferably smaller than 1 mm square. Furthermore, for example, the light emission range is preferably within a circular range with a diameter of 3 mm or less, or more preferably within a circular range with a diameter of 1 mm or less.

The light source system may be a light emitting body that emits light, or may be configured by adding other members. The light emitter is, for example, an LED or an EL.
The light source system of the present invention may include a light emitter that emits light, and a light emitting surface that emits light from the light emitter may be within the light emission range. Many LEDs emit light from the sides of the stacked semiconductors and reflect the emitted light forward with a concave mirror placed on the back of the semiconductor. On the other hand, a certain type of semiconductor emits light forward from the light emitting surface of the front surface thereof. In the case of using such a semiconductor, the front light emitting surface can be used as the light emission range. Since the EL also emits light from the front light emitting surface, the front light emitting surface can be used as a light emission range.

The light source system of the present invention includes a light emitting body that emits light, and an aperture that has an opening through which light emitted from the light emitting body passes, and that restricts light emitted from the light emitting body. The inner side may be the light emission range.
The light emitter in this case may have a light emitting surface, but may not have a light emitting surface. In this case, the light emitted from the light emitter is stopped by the aperture of the stop. The opening can be regarded as a light emission range. By using such a diaphragm, a light source system having a narrow light emission range that functions as a practical point light source can be easily realized without much effort to reduce the light emitting surface.
It is preferable that the diaphragm is provided at a position close to the light emitter because light from the light emitter is not wasted. For example, the diaphragm may be provided at a position within 2 mm from the light emitter. If the light emitter has a light emitting surface, the diaphragm is preferably provided at a position within 2 mm from the light emitting surface. Furthermore, the diaphragm may be brought into contact with the light emitter or the light emitting surface.

The cross-sectional shape of the edge along the opening of the diaphragm may be a knife edge shape that becomes thinner toward the edge.
The inventors of the present invention who prototyped the optical pointer noticed that the edge of the light spot generated by irradiating the object with the actual parallel light is not clear and blurry. The reason for this is that light from the illuminant hits the edge along the aperture of the aperture (generally, it has the same thickness as the plate-shaped aperture), and this is one reason. It has been found. Since the occurrence of such stray light can be effectively prevented by making the cross-sectional shape of the edge along the aperture of the diaphragm a knife edge, it is possible to clarify the edge of the light spot created by the optical pointer of the present application. become able to.

The shape of the aperture of the diaphragm may be any shape. The shape of the aperture of the diaphragm basically determines the shape of the light spot. By setting the shape of the aperture of the diaphragm to a desired shape as a light spot, the optical pointer of the present application generates a desired light spot on the object. There are circular, star, and line shapes (thin rectangles) as light spot shapes that can be created on an object using a general laser pointer, but the aperture shape is the same as each of these shapes. Can be.
When the light emitter has a light emitting surface, the shape of the aperture of the stop can be different from the shape of the light emitting surface. If the light emitter is an LED or EL, their light emitting surface will usually be rectangular. In that case, for example, the shape of the opening may be a circle, a star, or the like, or may be a rectangle different from the shape of the light emitting surface.
In addition, the shape and size of the aperture of the aperture is a basic method of using the aperture so that the light from the light emitter passes through the entire aperture. In that case, the shape of the aperture of the diaphragm matches the shape of the light spot. When there is a portion where the light from the light emitter does not pass through the aperture of the diaphragm, the light spot has a shape lacking that portion.

As described above, the light source system may include a light emitting surface that is a surface that emits light. In that case, the light emitting surface may be perpendicular to the optical axis of the first lens and face the first lens.

In the optical pointer of the present application, a second lens having negative power may be disposed between the light source system and the first lens. A lens having negative power has a function of further expanding light from a light source system passing through the lens. This actually acts to bring the focal point of the first lens closer to the first lens. By disposing the second lens having such negative power between the light source system and the first lens, the distance from the light source system to the first lens can be reduced, and thus the optical pointer is reduced in size. It becomes easy.

It has already been described that the light spot formed on the object by the optical pointer should be more than a circle with a diameter of 5 mm, and more preferably more than a circle with a diameter of 10 mm. Based on this, the present invention can be as follows.
In the optical pointer of the present invention, the distance from the first lens to the object is within a range of a planned distance that is a distance from the first lens to the object that is assumed when the optical pointer is used. In some cases, the size of the light spot may be such that at least a part thereof protrudes from a circle having a diameter of 5 mm. The planned distance is the distance from the first lens to the target assumed when using the optical pointer. According to the instruction manual, etc., the planned distance should be determined by the optical pointer manufacturer / operator so that the distance between the optical pointer and the object is within this range. It will be the distance to call attention. In most cases, the expected distance is expected to be within a range of several tens of centimeters to 10 meters. In the case where the object is located in the entire range of the planned distance, if the light spot generated on the object is such that at least a part of the light spot protrudes from a circle having a diameter of 5 mm, the light spot Is easy to see.
If the distance from the first lens to the object is within the predetermined distance, the size of the light spot is such that at least a part of the light spot protrudes from a circle having a diameter of 10 mm. The light spot is still easy to see.
On the other hand, if the light spot is too large, the location indicated by the light spot may be unclear. In that sense, it is preferable that the size of the light spot when the distance from the first lens to the object is within the range of the planned distance is within a circle having a diameter of 60 mm. More specifically, it is more preferable that the size of the light spot when the distance from the first lens to the object is within the range of the predetermined distance is within a circle having a diameter of 40 mm. If the size of the light spot always fits in a circle with a diameter of 40 mm, even if the distance from the first lens to the object changes, the viewer sees the change in the size of the light spot generated on the object. You can keep it to the extent you don't mind.
It is useful to increase the distance to the focus position of the light spot so that the change in the size of the light spot generated on the object does not occur so much even if the distance from the first lens to the object changes. This has been clarified by the study of the present inventor. Although the detailed reason is unknown, if the distance to the object is nearer than the focus position, the light spot generated on the surface of the object will only increase gradually even if the object is far away, When the distance to the object becomes farther than the focus position, the light spot generated on the surface of the object rapidly increases as the object becomes far away. Therefore, if the focus position of the light spot is farther than the predetermined distance, even if the distance from the first lens to the object changes, the size of the light spot generated on the object changes so much. Can not be.

When the light source system of the optical pointer of the present invention has a light emitter, the light emitted by the light emitter is in front of the light emitter (between the light emitter and the first lens, often in the immediate vicinity of the light emitter). A scattering filter that scatters the light may be disposed. If the object is present at the focus position of the optical pointer when the optical pointer is used, the light spot generated there forms an image of the portion of the illuminator that is emitting light. For example, when the light emitting body is an LED having a light emitting surface, a semiconductor pattern formed on the light emitting surface of the LED emerges at the light spot. When the focus position of the light spot is farther than the planned distance, a state in which the object is located exactly at the focus position usually occurs. If the scattering filter is present, it is possible to prevent a situation in which an image of the portion of the illuminant that is emitting light is formed at the light spot.
When the light source system has a stop, a scattering filter that scatters light emitted from the light emitter and is positioned in front of the light emitter may be disposed in the opening of the stop. In this way, all of the light passing through the aperture of the diaphragm can be scattered by the scattering filter. The scattering filter and the diaphragm are configured by a single plate having a function of scattering light emitted from the light emitter, and by preventing light from being transmitted around the plate, It may be made to function. By using the periphery of the scattering filter as a diaphragm, the cost of separately manufacturing the scattering filter and the diaphragm and combining them can be reduced. For example, if the periphery of a rectangular scattering filter is covered with, for example, a black paint that does not allow light to pass in such a way that a circular opening remains in the center of the rectangular scattering filter, the integrated diaphragm and scattering filter as described above can be obtained.

1 is a side sectional view schematically showing a configuration of an optical pointer according to an embodiment. FIG. 2 is a side sectional view showing a sectional shape of a diaphragm included in the optical pointer shown in FIG. The front view which shows the relationship between the light emission surface of the light-emitting body contained in the optical pointer shown in FIG. 1, and aperture opening. The side view which shows the behavior of the light in the optical pointer shown in FIG. The side view which shows the behavior of the light in the optical pointer of the modification 1. The side view which shows the behavior of the light in the optical pointer of the modification 2. The side view which shows the structure of the scattering filter in the optical pointer shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic side sectional view of an optical pointer according to this embodiment.
The optical pointer has a case 110. The optical pointer is formed by incorporating various components in the case 110 or attaching various components.
The case 110 is made of resin, although not limited to this. The case 110 has a cylindrical shape, although not limited thereto, and more specifically has a cylindrical shape.
A switch 120 is attached to the case 110, and a power supply unit 130, a light source system 140, a first lens 150, and a second lens 160 are built therein. The optical axes of the light source system 140, the first lens 150, and the second lens 160 are the same.

At least a part of the inner peripheral surface of the cylindrical case 110 has a device for preventing undesirable behavior of light emitted from the light source system 140. Specifically, at least a part of the inner peripheral surface of the case 110 is embodied as a means for preventing light from being reflected in a certain direction. The means for preventing the light from being reflected in a certain direction is that the light hitting a place on the inner peripheral surface of the case 110 is reflected in various directions, and thus is emitted from the light source system 140. Means for reducing the effect of stray light on actual parallel light (or a light spot created by the object), which will be described later, by dispersing stray light generated when the reflected light hits any part in case 110, etc. It includes both means for reducing the effect of stray light on actual parallel light (or light spots thereby created on the object) by attenuating the light reflected upon hitting a location on the inner peripheral surface of 110.
Preventing undesirable behavior of light emitted from the light source system 140 (light emitted from the light source system 140 that has passed through the first lens 150 and has become actual parallel light (or is thereby made on the object) At least a part of the inner peripheral surface of the cylindrical case 110 that is devised to reduce the influence of stray light on the light spot) is, for example, from the light source system 140 in the inner peripheral surface of the case. It may be in a range corresponding to 1/2 or more of the length corresponding to one lens 150. If the above-described device is applied within such a range, the effect of preventing an undesirable behavior of light emitted from the light source system 140 can be obtained. The range to which the above-mentioned device is applied may be a range extending from the light source system 140 to the entire length corresponding to the first lens 150 in the inner peripheral surface of the case 110. The reason that the above-mentioned device is not required to be devised behind the light source system 140 is that it does not contribute much to reduce the influence of stray light on actual parallel light.
As the former means, for example, it is possible to thread at least a part of the inner peripheral surface of the cylindrical case 110. The threading may be performed over the entire length of the inner peripheral surface of the case 110, for example. However, threading behind the light source system 140 (on the left side in FIG. 1) does not contribute much to reducing the effect of stray light on actual parallel light (or light spots created thereby on the object). If the threading is performed in the front part of the light source system 140 of the case 110, it is sufficient. As the former means, in addition to threading, it is conceivable to roughen the surface of the inner peripheral surface of the case 110 where the threading has been performed.
As the latter means, for example, at least a part of the inner peripheral surface of the cylindrical case 110 is set to a color (for example, black) that easily absorbs light. The range on the inner peripheral surface of the case 110 that should be a color that easily absorbs light is the same as the range on the inner peripheral surface of the case 110 that should be threaded or roughened as the former means. If the color of the resin constituting the case 110 is originally black, the entire inner peripheral surface of the case 110 is originally black. Therefore, even if the inner peripheral surface of the case 110 is not colored later, The inner peripheral surface can have a black color that easily absorbs light. However, by painting the inner surface of the case 110 with a black paint, at least a part of the inner peripheral surface of the case 110 can have a color that easily absorbs light. As another example of the latter means, it is conceivable to apply a known antireflection paint for preventing reflection of light to a desired area on the inner surface of the case 110.
Only one of the former means and the latter means can be employed, or both of them can be employed. In this embodiment, although not necessarily limited to this, threading is performed as the former device described above, and coloring with a black paint is performed as the latter device described above. The range of the former device is not limited to this, but is ahead of the light source system 140, and the range of the latter device is the entire inner peripheral surface of the case 110. The range of performing the above-described device of the former and the device of the latter may be the same, but not necessarily the same as in this embodiment.

A switch 120 is disposed on an appropriate portion of the side surface of the case 110. The switch 120 is for switching on / off (lighting and extinguishing) of a light source system, which will be described later. As long as it is possible, the switch 120 can adopt any known structure. That is, the configuration of the switch 120 need not be described below.
The switch 120 in this embodiment includes a switch member 121. The switch member 121 is fitted inside a hole 111 formed in an appropriate part of the case 110. In a normal state (a state where the switch member 121 is not pushed toward the inside of the case 110 as will be described later), the upper portion of the switch member 121 in FIG. An upward biasing force in FIG. 1 is applied to the switch member 121 by an elastic body (not shown). The switch member 121 can be pushed somewhat toward the inside of the case 110 against the urging force of the elastic body.
A plate-like first electrode 122 is attached to the lower end of the switch member 121 in FIG. Further, a plate-like second electrode 123 is also provided below the first electrode 122 of the switch member 121. When the switch member 121 is in a normal state, the first electrode 122 and the second electrode 123 are not in contact and are not conductive. On the other hand, when the switch member 121 is pushed into the case 110, the first electrode 122 and the second electrode 123 come into contact with each other and become conductive. In the switch 120 in this embodiment, the light source system is turned on when the first electrode 122 and the second electrode 123 are conducted, and the light source system is turned off when the first electrode 122 and the second electrode 123 are not conducted. Control is performed to achieve a state. A signal indicating whether or not the first electrode 122 and the second electrode 123 are conductive is transmitted to the power supply unit 130 through a connection line 124 connected to the second electrode 123.

The power supply unit 130 supplies power to the light source system 140.
The power supply unit 130 is, for example, a battery that is a battery, a power supply circuit for supplying power from the battery to the light source system 140, and the above-described signal received from the second electrode 123 via the connection line 124. Thus, the control circuit includes a control circuit that controls the power supply circuit to supply power to the light source system 140 or to prevent it from being performed. Since the battery, the power supply circuit, and the control circuit are all known or well known, detailed descriptions thereof are avoided.
The power supply circuit supplies power to the light source system 140 through the connection line 131.

In this embodiment, the light source system 140 includes a light emitter 141 and a diaphragm 142.
The light emitter 141 emits light. Although the light emitter 141 is not limited to this, in this embodiment, the light emitter 141 is an LED or an EL. The color of the light emitted from the light emitter 141 may be any number. The color emitted by the light emitter 141 is selected from, for example, red, blue, and green.
Although not limited to this, the light emitter 141 of this embodiment includes a light emitting surface 141A that is a surface that emits light. The light emitting surface 141 A faces the first lens 150 and the second lens 160.
The light emitting surface of a general LED is usually on the side of the substrate, but the light emitting surface 141A of the light emitter 141 of this embodiment is located in front of the substrate. In the case where the light emitter 141 is an LED and the light emitting surface 141A faces the first lens 150 and the second lens 160, such an LED can be employed.
When the light emitter 141 is an EL, it does not matter whether the EL is an organic EL or an inorganic EL. Since the light emitting surface of the EL is usually the front surface of the substrate, there is no inconvenience for allowing the light emitting surface to face the first lens 150 and the second lens 160 by using a normal EL.

The diaphragm 142 is a plate-like body having a function of narrowing the light emitted from the light emitting surface 141A included in the light emitting body 141, and includes an opening 142A for allowing the light emitted from the light emitting surface 141A to pass therethrough.
The diaphragm 142 is disposed as close as possible to the light emitting surface 141A of the light emitter 141. By doing so, light from the light emitting surface 141A can be prevented from being wasted as much as possible, and stray light is hardly generated. In this embodiment, the distance from the light emitter 141, more specifically, from the light emitting surface 141A to the stop 142 is kept at 2 mm or less. In both cases where the light emitter 141 is an LED or EL, the light emitting surface is usually covered with a glass plate that functions as a protective or transparent electrode. It is impossible to bring the light emitting surface 141A and the diaphragm 142 into contact with each other. However, by bringing the diaphragm 142 into contact with a glass plate (not shown) that covers the light emitting surface 141A of the light emitting body 141, the diaphragm 142 is disposed within 2 mm from the light emitting surface 141A in a state of contacting the light emitting body 141. Will be. In addition, the thickness of the above-mentioned glass plate is usually much thinner than 2 mm.
As described above, the diaphragm 142 has a plate shape and includes an opening 142A. Although not so in this embodiment, the portion of the diaphragm 142 may correspond to the cross-sectional shape of the internal space of the case 110. By doing so, stray light does not go to the first lens 150 from the outside of the diaphragm 142, and thus the influence of stray light on actual parallel light described later can be reduced. The size of the plate-like portion of the diaphragm 142 is determined by considering the irradiation angle of light from the light-emitting surface 141A of the light-emitting body 141 and the distance between the light-emitting surface 141A and the light from the light-emitting body 141 from the outside to the front (see FIG. The shape and size do not wrap around the right side in FIG.

Although not limited to this, the cross-sectional shape of the edge portion along the opening 142A of the diaphragm 142 in this embodiment is a knife edge shape that becomes thinner toward the edge. As shown in FIG. 2, the cross-sectional shape of the opening 142 A portion of the aperture 142 may be a single-edged shape as shown in FIGS. A double-edged shape as shown in FIG. Regardless of which shape is adopted, compared to the case where the knife edge shape is not adopted (when the edge of the opening 142A is a surface perpendicular to the plate-like portion of the aperture 142), the influence on the actual parallel light described later is affected. The generation of stray light that gives light can be reduced. Of course, stray light is least likely to occur in the case of (a). In this embodiment, such a shape is adopted as the cross-sectional shape of the opening 142A.

The relationship between the opening 142A of the diaphragm 142 and the light emitting surface 141A of the light emitter 141 can be as shown in FIG. 3, for example.
FIG. 3A shows a case where the light emitting surface 141A of the light emitter 141 is rectangular, and the opening 142A of the diaphragm 142 is a circle smaller than the light emitting surface 141A. FIG. 6B shows a case where the light emitting surface 141A of the light emitter 141 is rectangular and the opening 142A of the diaphragm 142 is a star shape smaller than the light emitting surface 141A. FIG. 6C shows a case where the light emitting surface 141A of the light emitter 141 is rectangular and the aperture 142A of the diaphragm 142 is a long and narrow rectangle smaller than the light emitting surface 141A. In any of these cases, since the opening 142A is smaller than the light emitting surface 141A, the light emitted from the light emitting surface 141A passes through all the portions of the opening 142A of the stop 142.
On the other hand, in FIG. 3D, the light emitting surface 141A of the light emitter 141 is rectangular, and the opening 142A of the diaphragm 142 is larger than the light emitting surface 141A (when the light source system 140 is viewed from the front, (At least a part of the contour line of the light emitting surface 141A can be seen.) This is a case of a circle. In such a case, the light emitted from the light emitting surface 141A does not pass through a part of the opening 142A of the diaphragm 142, although it depends on the irradiation angle of the light from the light emitting surface 141A. Even in such a functionally halfway or incomplete diaphragm 142, the diaphragm 142 of the present application can be used.

A scattering filter 170 may be provided between the light source system 140 and the first lens 150 in the vicinity of the light source system 140. The scattering filter 170 is a filter that is formed in a plate shape, a film shape, or the like for scattering light emitted from the light source system 140 toward the first lens 150.
The scattering filter 170 is, for example, as follows.
FIG. 7A shows an example of the scattering filter 170. In FIG. 7A, the scattering filter 170 is disposed in contact with the diaphragm 142. The scattering filter 170 has a plate shape or a film shape, and is disposed on the front side (first lens 150 side) of the diaphragm 142. The scattering filter 170 has a shape and size that covers the opening 142A of the diaphragm 142. In this embodiment, the scattering filter 170 is not limited to this, but has the same shape and size as the diaphragm 142.
FIG. 7B shows another example of the scattering filter 170. The scattering filter 170 in this example is disposed in the opening 142 A of the diaphragm 142. In this example, the thicknesses of the scattering filter 170 and the diaphragm 142 are the same, but this is not limited thereto.
FIG. 7C shows another example of the scattering filter 170. The scattering filter 170 in this example is integrated with the diaphragm 142. The scattering filter 170 is a single-piece filter having the same size and shape as the diaphragm 142 shown in FIGS. 7 (a) and 7 (b), the diaphragm 142 is present on one surface (not limited to this, but the rear surface in the example shown in FIG. 7 (c)). The coating material 143 is applied at a position corresponding to. The paint 143 is, for example, a black paint having a property of preventing light from passing therethrough. Such paint 143 forms a virtual aperture around the scattering filter 170. Since this de facto stop is very thin, the same effect is obtained as when the inner periphery of the stop 140 has a knife edge shape. Even if a thin film or the like that does not transmit light is applied to the scattering filter 170 instead of applying the paint 143, the scattering filter 170 integrated with the aperture 142 similar to that shown in FIG. 7C is obtained. be able to.

The first lens 150 is a lens having positive power. The first lens 150 can be composed of a single convex lens (whether it is a single convex lens or a biconvex lens). The first lens 150 may be composed of a plurality of lenses.
The first lens 150 has a theoretical point where light emitted from a predetermined point light source becomes parallel light after passing through the first lens 150. If it is assumed that the second lens 160 does not exist, that point is the focal point of the first lens 150.
A range perpendicular to the optical axis, in which the light passing through the first lens 150 can be said to be practically parallel light, centered on the theoretical point, in other words, an optical pointer is practical. In this case, a light spot generated on the object when the object that has passed through the first lens 150, which is strictly parallel light although it is not strictly parallel light, is passed a predetermined distance, The light emission range in the present application is a range perpendicular to the optical axis that is small enough to be judged to be able to perform the same function as a light spot formed by an existing laser pointer. In the light source system 140 described above, the aperture 142A of the diaphragm 142 included in the light source system 140 is on the optical axis of the first lens 150, and defines a planar light emission range that is perpendicular to the optical axis. To do.
The closer the light source system 140 is to the point light source, the more light from the light source system 140 that passes through the first lens 150 and becomes actual parallel light becomes more complete parallel light. Therefore, as a matter of course, the smaller the light emission range, the better. The light emission range in this embodiment is, for example, smaller than 5 mm square. If the light emission range is smaller than 5 mm square, the size of the light spot that can be obtained by applying parallel light to the object when the distance from the optical pointer to the object is about 3 m is smaller than 30 mm square. There is no inconvenience in using the pointer in the same manner as the laser pointer. It is more preferable to make the light emission range smaller than 3 mm square so that the size of the light spot does not change even if the distance from the light pointer to the target range is changed. If it is achieved more simply, it is more preferable to make the light emission range smaller than 1 mm square. More specifically, the light emission range should be included in a circular range having a diameter of 3 mm centered on the above-described theoretical point, and should be included in a circular range having a diameter of 1 mm. Is even better. In this embodiment, the light emission range is set to fall within a circular range having a diameter of 1 mm.

The second lens 160 is a lens having negative power. The second lens 160 can be composed of a single concave lens (whether it is a single concave lens or a biconcave lens). The second lens 160 may be composed of a plurality of lenses.
The second lens 160 functions to bring the focal point of the first lens 150 closer to the first lens 150. The irradiation angle of light from the light source system 140 that has passed through the second lens 160 is larger than that before passing through the second lens 160. As a result, the focal point of the first lens 150 approaches the first lens 150. The position of the focal point of the first lens 150 that has come close to the first lens 150 due to the presence of the second lens 160 is included in the light emission range described above. The first lens 150 and the second lens 160 are designed to be so.

Although not necessarily limited to this, in the optical pointer according to this embodiment, the size of the light spot generated on the target is so much even if the distance from the optical pointer to the target is more precisely, the first lens 150 is changed. In order not to change, the focus position of the light spot is set to the far distance. Specifically, the focus position of the light spot (the position at which the image of the light source system 140 (for example, the inner portion of the opening 142A if the stop 142 is present) forms an image from the first lens 150 beyond the planned distance). It is supposed to be far away. The planned distance is a distance from the first lens 150 to the target that is assumed when the optical pointer of this embodiment is used.
In this embodiment, although not limited thereto, the size of the light spot when the distance from the first lens 150 to the target object is within the range of the planned distance is at least from the circle having a diameter of 5 mm. Some of them are supposed to be eaten out. More specifically, in this embodiment, when the distance from the first lens 150 to the object is within the range of the planned distance, the size of the light spot protrudes at least partially from a circle with a diameter of 10 mm. It has come out.
On the other hand, in this embodiment, although not limited to this, the size of the light spot when the distance from the first lens to the target object is within the range of the planned distance is within a circle with a diameter of 60 mm. It has become. More specifically, in this embodiment, but not limited to this, when the distance from the first lens 150 to the object is within the range of the planned distance, the size of the light spot is a circle having a diameter of 60 mm. It comes to fit.
If the size of the light spot when the distance from the first lens 150 to the object is within the range of the planned distance is set within a circle with a diameter of 5 mm to a circle with a diameter of 60 mm, the person who sees the light spot This is because it is easy to visually recognize a light spot having a certain size, and it is difficult to understand what the light spot indicates because the light spot is too large. In that sense, the size of the light spot when the distance from the first lens 150 to the object is within the range of the planned distance is within a circle with a diameter of 10 mm to a circle with a diameter of 40 mm. If the change in the size of the light spot within the range of the best distance is within this range, the change in the size of the light spot due to the change in the distance from the first lens 150 to the object is determined as the light spot. You don't have to feel that much.

Next, the usage method and operation of this optical pointer will be described.
The method of using the optical pointer is the same as the method of using a general laser pointer.
In order to use the optical pointer, the user holds the optical pointer and operates the switch 120 to turn on the light source system 140. In order to turn on the light source system 140, the switch member 121 may be pushed into the case 110. When the switch member 121 is pushed into the case 110, a signal indicating that the first electrode 122 provided on the switch member 121 is electrically connected to the second electrode 123, and the first electrode 122 and the second electrode 123 are electrically connected, The power is transmitted from the second electrode 123 to the power supply unit 130 via the connection line 124. Upon receiving this signal, the power supply unit 130 sends power to the light emitter 141 of the light source system 140 via the connection line 131, and the light source system 140, more precisely, the light emitting surface 141A emits light.

When the light emitting surface 141A of the light source system 140 emits light, light L is emitted from the light emitting surface 141A at a predetermined irradiation angle (FIG. 4).
The light L emitted from the light emitting surface 141A is blocked by the plate-shaped portion of the diaphragm 142 at the outer peripheral portion, and the portion other than the outer peripheral portion passes through the opening 142A of the diaphragm 142. Since the cross-sectional shape of the edge portion along the opening 142 A of the diaphragm 142 is a knife edge shape, stray light hardly occurs when the light L passes through the diaphragm 142. The light L that has passed through the opening 142 A of the stop 142 is directed to the second lens 160. When passing through the second lens 160, the irradiation angle of the light L increases.
The light L that has passed through the second lens 160 travels toward the first lens 150. The light L that has passed through the first lens 150 becomes practically parallel light.
As described above, a device for preventing an undesirable behavior of the light L emitted from the light source system 140 exists on at least a part of the inner peripheral surface of the case 110. Therefore, for example, even if an unintended influence is generated from the light L emitted from the light source system 140, the influence exerted on the light L that has actually passed through the first lens 150 and becomes parallel light is kept small. It is done. For example, if the attenuation rate when the stray light is reflected once on the inner peripheral surface of the case 110 is 95%, if the stray light is reflected twice, the stray light after being reflected twice is 0.05 × 0. Since it is significantly lower than the original 1% from the equation of 05 = 0.005, the influence of the light on the light L that is actually parallel light can be almost ignored.

The light L that is actually parallel light hits the object, and a light spot is formed there. The shape of the light spot is the same as the shape of the light L when it passes through the opening 142A of the stop 142. However, the outline is slightly blurred because the light L is not a perfect parallel light but an actual parallel light. If the relationship between the aperture 142A of the aperture 142 and the light emitting surface 141A of the light emitter 141 is as shown in FIGS. 3A to 3D, the light spot that can be produced is as shown in FIG. If the case is (b), the star shape is slightly blurred. If the case is (c), the elongated rectangle is slightly blurred. In some cases, the rectangle is slightly blurred with four corners chamfered.

As described above, in this embodiment, the size of the light spot when the distance from the first lens 150 to the target object is within the range of the planned distance falls within a circle with a diameter of 5 mm to a circle with a diameter of 60 mm. More specifically, it fits within a circle having a diameter of 10 mm to a circle having a diameter of 40 mm.
A table showing the diameters of the light spots actually measured with the optical pointer prototype of the present embodiment is shown in Table 1 below. The actual measurement values of the light spots in Table 1 are those obtained by measuring the focus position of the light spot from the first lens 150 under three measurement conditions of 300 cm, 600 cm, and 1500 cm, and in any case, the light source system The light emission range of 140 is a circle having a diameter of 1 mm, and the characteristics of the first lens 150 are the same under the conditions of lens diameter = 20 mm, effective diameter = 16 mm, and f = 80. Further, the numerical values shown in Table 1 indicate the diameters of the light spots, which were all circular. The object is a surface perpendicular to the optical axis of the first lens 150.
All the light spots corresponding to the numerical values shown in Table 1 are circular, and all the numerical values shown in Table 1 indicate the diameter of each light spot in mm.

As shown in Table 1, when the distance from the first lens 150 to the focus position is 300 cm, the diameter of the light spot has already exceeded 12 mm and 10 mm when the distance to the object is 10 cm. Even when the distance from the first lens 150 to the object is 300 cm that matches the focus position, the diameter of the light spot is 28 mm, and the diameter is less than 40 mm. When the object is 300 cm from the first lens 150, the surface of the object coincides with the focus position of the optical pointer. Therefore, the surface of the light emitter (which is an LED in the prototype) is originally intended. A semiconductor pattern or the like should appear in the light spot, but this is not the case because of the function of the scattering filter described above. On the other hand, when the distance from the first lens 150 to the object becomes longer, the diameter of the light spot increases rapidly, and when the distance from the first lens 150 to the object reaches 600 cm, the diameter exceeds 60 mm. End up. When the distance from the first lens 150 to the object becomes 1000 cm, the diameter of the light spot increases and becomes 118 mm. When the distance from the first lens 150 to the focus position is 300 cm, if the planned distance is 0 cm to 500 cm, a light spot with a diameter of 10 mm is used regardless of where the object is located. To fit within a circle with a diameter of 60 mm. On the other hand, if the planned distance is set to 0 cm to slightly less than 400 cm (for example, 380 cm), the size of the light spot will be within a circle with a diameter of 10 mm to a circle with a diameter of 40 mm no matter where the object is located. become.
When the distance from the first lens 150 to the focus position is 600 cm, except for some cases where the distance from the first lens 150 to the object is small, the diameter of the light spot is from the first lens 150. It is the same or smaller than when the distance to the object is 300 cm. The difference increases as the distance from the first lens to the object increases. When the distance from the first lens 150 to the focus position is 600 cm, the diameter of the light spot has already exceeded 12 mm and 10 mm when the distance to the object is 10 cm. Even when the distance to the object is 400 cm, the diameter of the light spot is 37 mm, and the diameter is less than 40 mm. Even when the distance from the first lens 150 to the object is 600 cm which matches the focus position, the diameter of the light spot is 56 mm, and the diameter is less than 60 mm. At this time, the semiconductor pattern or the like on the surface of the light emitter does not float in the light spot as in the case described above. The diameter of the light spot exceeds 60 mm when the object is separated from the first lens 150 by 800 cm, and the diameter of the light spot at that time is 78 mm. When the distance from the first lens 150 to the focus position is 600 cm, if the planned distance is set to a little over 0 cm to 600 cm (for example, 630 cm), the size of the light spot is no matter where the target is in that range. Will fit within a circle with a diameter of 10 mm to a circle with a diameter of 60 mm. On the other hand, if the planned distance is 0 cm to slightly over 400 cm (for example, 420 cm), the size of the light spot will be within a circle with a diameter of 10 mm to a circle with a diameter of 40 mm no matter where the object is located. become.
When the distance from the first lens 150 to the focus position is 1500 cm, the diameter of the light spot is 600 cm from the first lens 150 to the object regardless of the distance from the first lens 150 to the object. In comparison, when the distance from the first lens 150 to the object is approximately less than 600 cm, the same or smaller, and when the distance from the first lens 150 to the object is approximately greater than 600 cm, They are the same or larger. In the case where the distance from the first lens 150 to the object is approximately greater than 600 cm, the difference between them increases as the distance from the first lens to the object increases. When the distance from the first lens 150 to the focus position is 1500 cm, the diameter of the light spot has already exceeded 12 mm and 10 mm when the distance to the object is 10 cm. And when the distance to the object is 400 cm, the diameter of the light spot is 41 mm, and the diameter exceeds 40 mm. Even when the distance from the first lens 150 to the object is 600 cm, the diameter of the light spot is 56 mm, and the diameter is less than 60 mm. The diameter of the light spot exceeds 60 mm when the object is separated from the first lens 150 by 800 cm, and the diameter of the light spot at that time is 71 mm. The diameter of the light spot is even smaller than when the distance from the first lens 150 to the focus position is 600 cm. When the distance from the first lens 150 to the focus position is 1500 cm, if the planned distance is 0 cm to slightly less than 700 cm (for example, 680 cm), the size of the light spot is large no matter where the target is in that range. Will fit within a circle with a diameter of 10 mm to a circle with a diameter of 60 mm. On the other hand, if the planned distance is set to 0 cm to slightly less than 400 cm (for example, 380 cm), the size of the light spot will be within a circle with a diameter of 10 mm to a circle with a diameter of 40 mm no matter where the object is located. become.

When the user operates the switch 120 to turn off the light source system 140, the light source system 140 stops irradiating light, and the light spot projected on the object disappears.
In order to turn off the light source system 140, the user only has to lift his finger from the switch member 121. Then, the switch member 121 returns to the original position shown in FIG. 1 by the biasing force from the elastic body (not shown). At that position, the first electrode 122 and the second electrode 123 are not conductive, and the power supply unit 130 stops supplying power to the light source system 140 based on the first electrode 122 and the second electrode 123. Therefore, the light source system 140 is turned off. It becomes.

[Modification 1]
The optical pointer of the first modification is configured almost in the same manner as the optical pointer of the above-described embodiment. The configuration of the light source system 140 is different from the configuration of the optical pointer according to the above-described embodiment in the configuration of the optical pointer according to the first modification.
The light source system 140 in the optical pointer of Modification 1 does not have a diaphragm and is configured only by the light emitter 141 (FIG. 5). The light emitter 141 includes a light emitting surface 141A as in the above-described embodiment. The light emitting surface 141A is perpendicular to the optical axis and faces the second lens 160, as in the above-described embodiment.
In the first modification, the light emitting surface 141A itself corresponds to the light emission range in the above-described embodiment. Therefore, the light emitting surface 141A of the light emitter 141 of the first modification example exists at a position where the light emission range in the above-described embodiment should be located, and the shape and size thereof should be satisfied by the light emission range in the above-described embodiment. It fits in size. The light emitting surface 141A may have any shape. However, when the light emitting body 141 is an LED or an EL, the current manufacturing technology allows the light emitting surface 141A of the light emitting body 141 to have a rectangular shape including a square. There will be no.
The usage method and operation of the optical pointer of Modification 1 are the same as those in the above-described embodiment except that the light L is not focused by the diaphragm.

[Modification 2]
The optical pointer of Modification 2 is configured almost in the same manner as the optical pointer of the above-described embodiment. The optical pointer according to the second modification differs from the optical pointer according to the above-described embodiment in that the optical pointer according to the second modification does not have the second lens included in the optical pointer according to the above-described embodiment. It is.
Since the optical pointer of Modification 2 does not have the second lens, the irradiation position is located at a position including the focal point of the original first lens 150 that is not close to the first lens 150.
The optical pointer without the second lens has a larger size in the front-rear direction than the optical pointer of the above-described embodiment.
The usage method and operation of the optical pointer of Modification 2 are the same as those in the above-described embodiment except that the light L does not pass through the second lens.
Note that the light source system 140 of the optical pointer according to the second modification may be changed to that according to the first modification.

Claims

A first lens that is a lens having positive power;
On the optical axis of the first lens, the light exiting from the light-emitting range, which is a narrow range such that light emitted from the range becomes actual parallel light after passing through the first lens, is directed toward the first lens. A light source system adapted to emit light;
Have
The light, which is actually parallel light hitting a given object, is designed to create a light spot,
Light pointer.
The light emission range is smaller than 5 mm square,
The optical pointer according to claim 1.
The light source system includes a light emitter that emits light, and a light emitting surface that emits light from the light emitter is within the light emission range.
The optical pointer according to claim 2.
The light source system includes a light emitter that emits light, and an aperture that has an opening that allows light emitted from the light emitter to pass through, and an inner side of the opening that is configured to restrict light emitted from the light emitter. It is the light emission range,
The optical pointer according to claim 2.
The diaphragm is provided at a position within 2 mm from the light emitter.
The optical pointer according to claim 4.
The diaphragm is brought into contact with the light emitter,
The optical pointer according to claim 4.
The cross-sectional shape of the edge along the opening of the diaphragm is a knife edge shape that becomes thinner toward the edge,
The optical pointer according to any one of claims 4 to 6.
The shape of the aperture of the diaphragm is circular,
The optical pointer according to any one of claims 4 to 7.
The light emitter includes a light emitting surface that emits light, and the shape of the opening of the diaphragm is different from the shape of the light emitting surface.
The optical pointer according to any one of claims 4 to 7.
The light emitter is an LED or an EL,
The optical pointer according to claim 3 or 4.
The light emitting body includes a light emitting surface that is a surface that emits light, and the light emitting surface faces the first lens direction so as to be perpendicular to the optical axis of the first lens.
The optical pointer according to claim 10.
A second lens having negative power is disposed between the light source system and the first lens.
The optical pointer according to claim 1.
The size of the light spot when the distance from the first lens to the object is within the range of the planned distance that is the distance from the first lens to the object that is assumed when the optical pointer is used. However, at least a part of the circle with a diameter of 5 mm protrudes from the circle.
The optical pointer according to claim 1.
When the distance from the first lens to the object is within the range of the planned distance, the size of the light spot is such that at least a part thereof protrudes from a circle having a diameter of 10 mm.
The optical pointer according to claim 13.
The size of the light spot when the distance from the first lens to the object is within the range of the planned distance is within a circle with a diameter of 60 mm.
The optical pointer according to claim 13 or 14.
The size of the light spot when the distance from the first lens to the object is within the range of the planned distance is within a circle with a diameter of 40 mm.
The optical pointer according to claim 15.
The focus position of the light spot is farther than the planned distance,
The optical pointer according to claim 1.
A scattering filter that scatters the light emitted by the light emitter is disposed in front of the light emitter.
The optical pointer according to claim 2, 3, or 17.
A scattering filter that scatters the light emitted by the light emitter is disposed in front of the light emitter,
The scattering filter is disposed in the aperture of the aperture;
An optical pointer according to claim 3.
The scattering filter and the diaphragm are configured by a single plate having a function of scattering light emitted from the light emitter, and by preventing light from being transmitted around the plate, Can be made to function,
The optical pointer according to claim 19.