CN210179360U - Laser flashlight optical system with multiple optical axes and laser flashlight - Google Patents

Abstract

The utility model relates to a laser flashlight optical system with multiple optical axes and a laser flashlight, wherein the optical system comprises an incident optical system, a wavelength conversion device and an emergent optical system; the incident optical system comprises a laser and an optical reflector, wherein the laser is used for emitting exciting light; the wavelength conversion device is a Lambert-type scatterer and is used for absorbing part of exciting light to form stimulated light; the excited light and the excited light which is not absorbed by the wavelength conversion device form illumination light to be emitted by an emission optical system; the first optical axis of the exciting light emitted by the laser and the second optical axis of the emitting optical axis of the illuminating light are parallel and staggered. An optical reflector enables exciting light to enter the wavelength conversion device after being folded through a multi-optical-axis light path to form illuminating light, the high-efficiency long-distance illuminating effect is achieved, the risk of using a high-power laser technology is reduced, and the flashlight is small in size.

Description

Laser flashlight optical system with multiple optical axes and laser flashlight

Technical Field

The utility model relates to a flashlight technical field, more specifically relates to a laser flashlight optical system and laser flashlight that have many optical axes.

Background

The handheld lighting device is also called a flashlight, and due to the excellent portability, the handheld lighting device is widely used in many outdoor and other special application occasions, such as outdoor mountaineering, exploration, police search and rescue, small space lighting and other scenes.

The handheld lighting device is generally composed of a barrel and a barrel head, a power supply battery is arranged in the barrel, a specific light-emitting device is arranged on the barrel head, the handheld lighting device is applied to the light-emitting device of the flashlight, most traditional light source is a low-power halogen bulb, the light source has good color rendering, but the brightness and the efficiency are not superior, and the short service life is a fatal defect. Secondly, the semiconductor lighting LED which is popular in recent years is taken as a new light source, has high luminous efficiency, long service life and good stability, and tends to replace the traditional light source in various application fields. However, due to the extremely high requirement of portability when applied to the field of flashlights, the traditional halogen lamp or the LED light source is not an ideal point light source, which increases difficulty for secondary optics applied to the field of flashlights and brings unfavorable factors to the volume of the flashlights.

The development and application of the newer semiconductor laser technology has brought new opportunities for new flashlights, and the advantages of semiconductor lasers in the field of application of flashlights, such as directional lighting, are particularly prominent due to their excellent directivity, approaching point light sources as ideal light sources, and the high brightness of the laser. Based on the two characteristics of the laser, the volume of the flashlight can be greatly reduced, and the light irradiation distance is longer.

However, another problem of the laser is the safety of the laser, and the energy density of the laser is very high due to the high brightness of the laser, so that when a laser with such high power is used, the high power laser needs to be used with special caution because the laser is carelessly easy to cause serious injury to eyes or skin of related personnel, even serious accompanying injury such as fire, scald and the like, and especially irreversible injury to eyes of users.

Disclosure of Invention

The utility model aims at overcoming the defect among the above-mentioned prior art, provide a laser flashlight optical system who has many optical axes, when the characteristics of the fabulous directionality of flashlight make full use of laser and high luminance including this optical system realize the remote illumination of high efficiency, reduced the risk of using high-power laser technology widely, and the flashlight is small.

In order to achieve the purpose, the utility model adopts the technical proposal that: the laser flashlight optical system with multiple optical axes comprises an incident optical system, a wavelength conversion device and an emergent optical system; the incident optical system comprises a laser and an optical reflector, the laser is used for emitting exciting light, the optical reflector is used for reflecting the exciting light for the first time to fold the light beam to form a multi-optical axis and guiding the folded exciting light to the wavelength conversion device; the wavelength conversion device is a Lambert-type scatterer and is used for absorbing part of exciting light to form stimulated light; the excited light and the excited light which is not absorbed by the wavelength conversion device form illumination light to be emitted by an emission optical system; the first optical axis of the exciting light emitted by the laser and the second optical axis of the emitting optical axis of the illuminating light are parallel and staggered.

Since the wavelength conversion device is a lambertian scatterer, excitation light emitted by the laser enters the wavelength conversion device at any angle and is partially absorbed by the wavelength conversion device to form excited light, the excited light and the excitation light which is not absorbed by the wavelength conversion device form illumination light, and the illumination light is equivalent to a lambertian light emitter.

Defining the length direction of the flashlight as the longitudinal direction and the direction vertical to the longitudinal direction as the transverse direction; the first optical axis of the exciting light place that the laser sent and the setting of staggering of second optical axis as the outgoing optical axis of illumination light make the exciting light that the laser sent be vertical, and then make the setting of laser not make the flashlight transverse dimension than original big a lot.

In the scheme, the reflecting action of one optical reflector enables exciting light to enter the wavelength conversion device after being folded through a multi-optical-axis light path, and illuminating light formed after passing through the wavelength conversion device is emitted by the emitting optical system, so that a high-efficiency long-distance illuminating effect is realized; in addition, the use of one optical reflector to reflect the light beam to fold the light beam increases optical efficiency while reducing flashlight design complexity as compared to the use of multiple optical reflectors.

Preferably, the incidence optical system further comprises a first lenslet arranged between the laser and the optical reflector, the first lenslet being adapted to focus the diverging blue excitation light emitted by the laser. The arrangement is such that the cross-sectional area of the blue excitation beam at the optical reflector position can be reduced during the transmission of the laser light, thereby reducing the area of the optical reflector.

Further preferably, a second lenslet is provided between the optical reflector and the wavelength conversion device in the light propagation direction, the entrance optical system and the exit optical system each including the second lenslet. The blue excitation light reflected by the optical reflector is incident on the wavelength conversion device from the edge region of the second small lens in a large field angle range; this arrangement facilitates focusing of the blue excitation light on the wavelength conversion device, so that the wavelength conversion device absorbs part of the excited light formed by the excitation light to synthesize high-energy-density illumination light with the unabsorbed excitation light.

Still further preferably, the exit optical system further includes an exit lens provided at an outermost portion in the light exit direction; the wavelength conversion device is positioned on a combined focus of the light-emitting lens and the second small lens; the excited light and the excited light which is not absorbed by the wavelength conversion device are collimated by the second small lens and the light-emitting lens to form nearly parallel illuminating light to be emitted. Different sizes and parameters of the light-emitting lens can be selected according to use requirements to match, so that the illumination angle of the illumination system is changed, and the requirement of distance change is met.

Preferably, a shielding structure is provided behind the optical reflector in the emission direction of the blue excitation light. The shielding structure can be a baffle plate, so that the use risks of damage or accidental use of an optical system in the use process, direct emission of original blue excitation light caused by burning loss of each optical component in the laser conduction process and the like can be avoided, and the accidental use of the laser flashlight can be prevented; in addition, the shielding structure also has the function of preventing light from overflowing.

Further preferably, the optical system further comprises an optical glass flat sheet or a diffusion sheet with a light scattering function, and the optical glass flat sheet or the diffusion sheet with the light scattering function is arranged perpendicular to the second optical axis and is used for installing the shielding structure. The optical glass flat sheet or the diffusion sheet with the light scattering function is convenient for the installation and fixation of the shielding structure, can not block light, and is convenient for the emergence of illumination light.

Preferably, the optical reflector has a specular reflection area larger than a cross-sectional area of the incident blue excitation light beam. The arrangement can prevent light loss caused by light overflow and ensure high brightness of the flashlight.

Preferably, the wavelength conversion device is a yellow phosphor flake. The yellow phosphorus fluorescent powder is excited by part of exciting light to form excited light.

The utility model also provides another laser flashlight optical system with multiple optical axes, which comprises the incident optical system, the wavelength conversion device and the emergent optical system; the incident optical system is multiple and arranged around the wavelength conversion device; and a second small lens is arranged between the integral structure formed by the optical reflectors in all the incident optical systems and the wavelength conversion device, and the incident optical system and the emergent optical system comprise the second small lens.

Above-mentioned scheme can be used for realizing high efficiency long distance or super long distance illumination, reduces the risk of using high-power laser technology simultaneously, and the flashlight is small.

In the prior art, in order to realize ultra-long distance illumination, a plurality of lasers are required to be coupled into a single beam of light to be emitted, at this time, a dichroic mirror is usually used as a light combining device to obtain illumination light, a reflective film for blue excitation light is designed on a coating film of the dichroic mirror, the reflective film is highly transparent to yellow light, when the blue excitation light is incident on the dichroic mirror, a first part of the blue excitation light is reflected and guided onto a wavelength conversion device, and a second part of the blue excitation light is transmitted and guided onto a lambertian scatterer by the dichroic mirror to form a lambertian secondary light source. The yellow light excited and radiated on the wavelength conversion device and the lambertian secondary light source formed are recombined on the dichroic mirror to form required illumination light, the scheme needs the dichroic mirror to perform light splitting and light combining functions, and is equivalent to two optical systems, the corresponding design volume of a product can be increased, the carrying is inconvenient, and the greatest significance of portability is lost.

The laser is a semiconductor laser device capable of emitting blue excitation light and is arranged on a first optical axis, the excitation light emitted by the laser is focused by a first small lens along the first optical axis, then the focused blue excitation light is deflected by an optical reflector, the deflected blue excitation light is guided to a wavelength conversion device (yellow phosphorus fluorescent powder sheet), the wavelength conversion device is excited by part of the blue excitation light to form excited light, the excited light and the excitation light which is not absorbed by the wavelength conversion device are collimated by a second small lens and a light emitting lens to form approximately parallel illumination light for emitting, and therefore the effect of realizing high-efficiency remote illumination of the white laser flashlight is achieved.

Another object of the present invention is to provide a laser flashlight with multiple optical axes, which comprises a barrel and a barrel head, wherein the optical system is disposed in the barrel head; the barrel is internally provided with a battery for providing electric energy for the laser, and the barrel is provided with a switch for controlling the laser to be turned on and off.

Compared with the prior art, the beneficial effects of the utility model are that:

the reflecting action of an optical reflector enables exciting light to enter a wavelength conversion device after being folded through a multi-optical-axis light path, and illuminating light formed by the wavelength conversion device is emitted by an emitting optical system, so that a high-efficiency and long-distance illuminating effect is realized; in addition, the use of one optical reflector to reflect the light beam to fold the light beam increases optical efficiency while reducing flashlight design complexity as compared to the use of multiple optical reflectors.

Drawings

Fig. 1 is a schematic diagram of an optical system of a laser flashlight with multiple optical axes according to example 1.

Fig. 2 is a schematic diagram of an optical system of a laser flashlight with multiple optical axes according to embodiment 2.

Fig. 3 is a schematic diagram of an optical system for obtaining illumination light by combining blue excitation light emitted from a plurality of lasers using a dichroic mirror in the prior art in embodiment 2.

The attached drawings are as follows: 201 a laser; 301 a first lenslet; 401 an optical reflector; 501 second lenslet; 601 a light-emitting lens; 701 a first optical axis; 702 a second optical axis; 801 a shielding structure; 901 a wavelength conversion device; 1001 optical glass plain film; 2001 dichroic mirror.

Detailed Description

The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; certain well-known structures in the drawings and possible omissions of their description will be apparent to those skilled in the art.

Example 1

As shown in fig. 1, the present embodiment provides an optical system of a laser flashlight with multiple optical axes, which includes an incident optical system, a wavelength conversion device 901, and an exit optical system; the incident optical system comprises a laser 201 and an optical reflector 401, wherein the laser 201 is used for emitting blue excitation light, and the optical reflector 401 is used for reflecting the blue excitation light once to fold a light beam to form a multi-optical axis and guiding the folded blue excitation light to the wavelength conversion device 901; the wavelength conversion device 901 is a lambertian scatterer and is used for absorbing part of the excitation light to form excited light; the excited light and the excited light not absorbed by the wavelength conversion device 901 form illumination light to be emitted by the emission optical system; a first optical axis 701 on which blue excitation light emitted from the laser 201 is positioned and a second optical axis 702 as an emission optical axis of illumination light are arranged in parallel and offset.

Since the wavelength conversion device 901 is a lambertian scatterer, blue excitation light emitted from the laser 201 enters the wavelength conversion device 901 at any angle and is partially absorbed by the wavelength conversion device 901 to form excited light, the excited light and the excitation light that is not absorbed by the wavelength conversion device 901 form illumination light, and the illumination light corresponds to a lambertian light emitter.

Defining the length direction of the flashlight as the longitudinal direction and the direction vertical to the longitudinal direction as the transverse direction; the first optical axis 701 on which the blue excitation light emitted by the laser 201 is located and the second optical axis 702 serving as the exit optical axis of the illumination light are parallel and staggered, so that the blue excitation light emitted by the laser 201 is longitudinal, and the transverse size of the flashlight is not larger than that of the flashlight due to the arrangement of the laser 201.

In the utility model, the reflection action of an optical reflector 401 makes blue exciting light enter the wavelength conversion device 901 after passing through the folding back of many optical axis light paths, the illumination light formed after the wavelength conversion device 901 is emergent by the emergent optical system, realize the remote illuminating effect of high efficiency, because the blue exciting light that laser 201 sent is parallel and staggers the setting at the first optical axis 701 and the second optical axis 702 as the emergent optical axis of illumination light, the risk of using high-power laser technology has been greatly reduced, make the flashlight transverse dimension not much bigger than originally simultaneously, and the laser approaches some light source and makes the flashlight small; in addition, the use of one optical reflector 401 to reflect the light beam to fold the light beam increases optical efficiency while reducing flashlight design complexity as compared to the use of multiple optical reflectors.

Wherein the entrance optical system further comprises a first lenslet 301 arranged between the laser 201 and the optical reflector 401, the first lenslet 301 being adapted to focus the diverging blue excitation light emitted by the laser 201. This arrangement focuses the excitation light on the wavelength conversion device 901 via the incident optical system, and the laser light can reduce the cross-sectional area of the blue excitation beam at the optical reflector 401 during transmission, thereby reducing the area of the optical reflector 401.

Further, a second lenslet 501 is provided between the optical reflector 401 and the wavelength conversion device 901 in the light propagation direction, and the incident optical system and the exit optical system each include the second lenslet 501. The blue excitation light reflected by the optical reflector 401 is incident on the wavelength conversion device 901 from the edge region of the second lenslet 501 with a large field angle range; this arrangement facilitates focusing of the blue excitation light on the wavelength conversion device 901, so that the wavelength conversion device 901 absorbs part of the excited light formed by the excitation light to synthesize high-energy-density illumination light with the unabsorbed excitation light.

The emergent optical system also comprises an emergent lens 601 arranged at the outermost part of the emergent direction of the light; the wavelength conversion device 901 is located at the combined focal point of the light-emitting lens 601 and the second lenslet 501; the excited light and the excited light not absorbed by the wavelength conversion device 901 are collimated by the second small lens 501 and the light exit lens 601 to form nearly parallel illumination light and exit. Different sizes and parameters of the light-emitting lens 601 can be selected according to the use requirement to match, so as to change the illumination angle of the optical system and realize the requirement of distance change.

Further, a shielding structure 801 is provided behind the optical reflector 401 in the emission direction of the blue excitation light. By the arrangement, the use risks that the optical system is damaged or used accidentally in the use process, or the original blue excitation light is directly emitted due to burning loss of each optical component in the laser conduction process can be avoided, so that the accidental use of the laser flashlight is prevented; in addition, the shielding structure 801 also has a function of preventing light from overflowing.

The optical system further includes an optical glass flat sheet 1001 or a diffusion sheet with a light scattering function, and the optical glass flat sheet 1001 or the diffusion sheet with the light scattering function is perpendicular to the second optical axis 702 and is used for installing the shielding structure 801. The optical glass plate 1001 or the diffusion sheet with the light scattering function facilitates installation and fixation of the shielding structure 801, does not block light, and facilitates emergence of illumination light.

In addition, the optical reflector 401 has a specular reflection area larger than the cross-sectional area of the incident blue excitation light beam. The arrangement can prevent light loss caused by light overflow and ensure high brightness of the flashlight.

In this embodiment, the wavelength conversion device 901 is a yellow phosphor sheet. The yellow phosphorus fluorescent powder is excited by part of exciting light to form excited light.

In this embodiment, the laser 201 is a semiconductor laser device capable of emitting blue excitation light and is disposed on the first optical axis 701, the excitation light emitted by the laser 201 is focused by the first small lens 301 along the first optical axis 701, then the focused blue excitation light is deflected by the optical reflector 401, the deflected blue excitation light is guided to the wavelength conversion device 901 (yellow phosphorus phosphor sheet), the wavelength conversion device 901 is excited by a portion of the blue excitation light to form excited light, the excited light and the excitation light that is not absorbed by the wavelength conversion device 901 are collimated by the second small lens 501 and the light exit lens 601 to form approximately parallel illumination light for emission, so that the white laser flashlight 100 realizes efficient long-distance illumination.

The embodiment also provides a laser flashlight with multiple optical axes, which comprises a flashlight body and a flashlight head, wherein the flashlight head is internally provided with the optical system; the barrel is internally provided with a battery for providing electric energy for the laser, and the barrel is provided with a switch for controlling the laser to be turned on and off. The switch is arranged to facilitate turning the flashlight on and off.

Example 2

This embodiment provides another optical system of a laser flashlight with multiple optical axes, as shown in fig. 2, including the incident optical system, the wavelength conversion device 901 and the exit optical system described in embodiment 1; it differs from example 1 in that: the incident optical system is plural and provided around the wavelength conversion device 901; and a second small lens 501 is arranged between the integral structure formed by the optical reflectors 401 in all the incident optical systems and the wavelength conversion device 901, and the incident optical systems and the emergent optical systems both comprise the second small lens 501.

The embodiment can be used for realizing high-efficiency long-distance or ultra-long-distance illumination, simultaneously reduces the risk of using a high-power laser technology, and has small volume.

In order to realize ultra-long distance illumination in the prior art, a plurality of lasers are required to be coupled into a single beam for emission, as shown in fig. 3, in this case, a dichroic mirror 2001 is usually used as a light combining device to obtain illumination light, a reflective film for blue excitation light is designed on a coating film of the dichroic mirror 2001, the reflective film is highly transparent to yellow light, when the blue excitation light is incident on the dichroic mirror 2001, a first part of the blue excitation light is reflected and guided to a wavelength conversion device 901, and a second part of the blue excitation light is transmitted and guided to a lambertian scatterer by the dichroic mirror 2001 to form a lambertian secondary light source. In this way, the yellow light emitted by the excitation on the wavelength converter device 901 and the formed lambertian secondary light source are recombined on the dichroic mirror 2001 to form the required illumination light, and this scheme requires the dichroic mirror 2001 to perform the light splitting and combining functions, which is equivalent to two optical systems, which increases the corresponding design volume of the product, is inconvenient to carry and loses the greatest significance of portability.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A laser flashlight optical system with multiple optical axes is characterized by comprising an incident optical system, a wavelength conversion device (901) and an emergent optical system; the incident optical system comprises a laser (201) and an optical reflector (401), wherein the laser (201) is used for emitting exciting light, and the optical reflector (401) is used for reflecting the exciting light once to fold a light beam and guiding the folded exciting light to the wavelength conversion device (901); the wavelength conversion device (901) is a Lambert-shaped scatterer and is used for absorbing part of the excitation light to form excited light; the excited light and the excited light not absorbed by the wavelength conversion device (901) form illumination light to be emitted by an emission optical system; a first optical axis (701) on which excitation light emitted by the laser (201) is located and a second optical axis (702) which is an emission optical axis of illumination light are arranged in parallel and offset.

2. The laser flashlight optical system with multiple optical axes as claimed in claim 1, wherein the incident optical system further comprises a first small lens (301) disposed between the laser (201) and the optical reflector (401), the first small lens (301) being configured to focus the divergent blue excitation light from the laser (201).

3. A laser torch optical system with multiple optical axes according to claim 2, wherein a second lenslet (501) is arranged between the optical reflector (401) and the wavelength conversion device (901) along the light propagation direction, and the entrance optical system and the exit optical system both comprise said second lenslet (501).

4. The optical system of the laser flashlight with multiple optical axes as claimed in claim 3, wherein the exit optical system further includes an exit lens (601) disposed at the outermost portion of the light exit direction; the wavelength conversion device (901) is positioned on the combined focal point of the light-emitting lens (601) and the second small lens (501); the excited light and the excited light not absorbed by the wavelength conversion device (901) are collimated by the second small lens (501) and the light exit lens (601) to form nearly parallel illuminating light and then emitted.

5. The optical system of the laser flashlight with multiple optical axes as claimed in claim 1, wherein a shielding structure (801) is arranged behind the optical reflector (401) along the emission direction of the blue excitation light.

6. The optical system of the laser flashlight with multiple optical axes as claimed in claim 5, further comprising an optical glass flat sheet (1001) or a diffusion sheet with a light scattering function, wherein the optical glass flat sheet (1001) or the diffusion sheet with the light scattering function is arranged perpendicular to the second optical axis (702) and is used for installing the shielding structure (801).

7. The laser flashlight optical system with multiple optical axes as claimed in claim 1, wherein the optical reflector (401) has a specular reflection area greater than the cross-sectional area of the incident blue excitation beam.

8. The optical system of a laser torch with multiple optical axes as claimed in any one of claims 1 to 7, wherein the wavelength conversion device (901) is a phosphor yellow sheet.

9. The optical system of the laser flashlight with multiple optical axes as claimed in claim 1, wherein the incident optical system is multiple and is arranged around the wavelength conversion device (901); and a second small lens (501) is arranged between the integral structure formed by the optical reflectors (401) in all the incident optical systems and the wavelength conversion device (901), and the incident optical systems and the emergent optical systems comprise the second small lens (501).

10. A laser flashlight with multiple optical axes, which comprises a barrel body and a barrel head, wherein the barrel head is internally provided with the laser flashlight optical system with multiple optical axes, which is disclosed by any one of claims 1 to 9; the barrel is internally provided with a battery for providing electric energy for the laser, and the barrel is provided with a switch for controlling the laser to be turned on and off.

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