KR20160047019A - Laser flash - Google Patents

Abstract

An embodiment of the present invention relates to a laser flash for focusing light to a photographing area in a short distance. The laser flash according to an embodiment includes: a laser diode emitting a laser along an optical axis; a first lens arranged in one side of the laser diode, and arranged on the optical axis; a second lens spaced apart from the first lens, and arranged on the optical axis; and a third lens arranged between the first lens and the second lens on the optical axis, and moving toward the first lens along the optical axis or moving toward the second lens along the optical axis, wherein the first lens and the third lens are biconvex lenses, and the second lens is a plane convex lens.

Description

LASER FLASH

An embodiment relates to a laser flash, and more particularly to a laser flash having a zoom function.

Flash is a key device when taking pictures in dark places or at night, by flashing when shooting.

However, since the divergence angle of the conventional flash is fixed, there is a disadvantage that light is unnecessarily irradiated to the outside of the photographing range at the time of close-up photographing, and a disadvantage that photographing becomes difficult due to insufficient light to be irradiated to the subject there was.

An embodiment aims to provide a laser flash that allows light to be concentrated within a shooting range at a short distance.

It is also an object of the present invention to provide a laser flash capable of irradiating a sufficient amount of light to a subject at a long distance.

A laser flash according to an embodiment includes: a laser diode for emitting a laser along an optical side; A first lens disposed on one side of the laser diode and disposed on the optical side; A second lens spaced from the first lens and disposed on the optical side; And a third lens disposed on the optical side between the first lens and the second lens and moving toward the first lens along the optical side or moving toward the second lens along the optical side, ; Wherein the first lens and the third lens are biconvex lenses, and the second lens is a plane convex lens.

Here, the first lens includes a first surface S1 and a second surface S2, the radius of curvature of the one surface S1 is -14.80 mm or less at -9.50 mm or more, and the radius of curvature of the second surface S2 is 4.70 mm or more to 11.90 mm or less and the third lens includes the other surface S3 on the other surface S4 and the radius of curvature of the one surface S3 is not more than -12.20 mm at -4.50 mm or more, The radius of curvature of the other surface S6 is not less than 3.00 mm and not more than 15.00 mm and the second lens includes one surface S5 and the other surface S6 and the radius of curvature of the other surface S6 is not less than 10.20 mm and not more than 12.00 mm .

Here, the first lens, the second lens, and the third lens may include an FDS90.

According to the laser flash according to the embodiment, the divergence angle can be adjusted in a short distance or a long distance by including a third lens moving in the first lens direction or the second lens direction between the first lens and the second lens, Since the lens and the third lens are biconvex lenses and the second lens is a flat convex lens, the divergence angle can be flexibly adjusted from about 13 DEG to about 60 DEG.

According to the laser flash according to the embodiment, since the radius of curvature of each lens is determined, it is possible to solve the problem of the shape which is actually emitted to the target and the problem of the light-converging property of the laser diode.

According to the laser flash according to the embodiment, since the first lens, the second lens and the third lens include the FDS90, the refractive index can be increased, the heat dispersion can be reduced, and the durability can be improved.

1 is a configuration diagram of a laser flash according to an embodiment.
FIG. 2 is a view showing a divergence angle of the laser diode beam flash according to the embodiment. FIG.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

In the description of the embodiments according to the present invention, in the case where an element is described as being formed on "on or under" another element, the upper (upper) or lower (lower) (On or under) all include that the two elements are in direct contact with each other or that one or more other elements are indirectly formed between the two elements. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

Hereinafter, a laser flash according to an embodiment of the present invention will be described with reference to the accompanying drawings.

<Embodiment>

1 is a configuration diagram of a laser flash according to an embodiment.

Referring to FIG. 1, a laser flash according to an embodiment may include a laser diode 100, a first lens G1, a second lens G2, and a third lens G3.

Specifically, the laser diode 100 emits a laser along an optical axis as a light source.

The first lens G1 is disposed on one side of the laser diode 100 and can be disposed on the optical side. The first lens G1 may be a biconvex lens. Biconvex lenses are convex lenses that protrude outward on both sides.

The third lens G3 is spaced from the first lens G1 and can be disposed on the optical side. The third lens G3 may be a plane convex lens. A flat convex lens is a single lens whose one surface is flat and the other one is a convex surface.

The second lens G2 may be disposed on the optical side between the first lens G1 and the third lens G3 which are spaced apart. The second lens G2 may move in the direction of the first lens G1 along the optical side or in the direction of the third lens 230 along the optical side to adjust the divergence angle. The second lens G2 may be a biconvex lens.

The laser emitted from the laser diode 100 is collimated by the first lens G1 and condensed by the second lens G2. The light condensed between the second lens G2 and the third lens G3 can be collimated by the third lens G3 or widely diffracted after focusing through the third lens G3.

Hereinafter, an embodiment of the laser flash will be described with reference to [Table 1].

The first lens G1 includes one surface S1 and the other surface S2 and the second lens G2 includes one surface S3 and the other surface S4, The lens G3 may include one surface S5 and another surface S6.

The radius of curvature of each of the surfaces S1 to S6 of the first lens G1, the second lens G2 and the third lens G3 may be the same as in Table 1.

Surface No. Curvature radius (R) (mm) S1 -9.50 to -14.80 S2 4.70 ~ 11.90 S3 -4.50 to -12.20 S4 3.00 ~ 15.00 S5 Infinity S6 10.20-12.00

Here, the range of S1 is -9.50 to -14.80 mm. If the range is out of this range, there is a problem in the form problem of divergence to the actual target and the light condensing property of the laser diode. For example, if the range of S1 is given as -8.00 mm, the surrounding illuminance can be brightened, but the illuminance of the center becomes relatively dark compared to the surroundings.

Also, when S2, S3, S4, and S6 described in Table 1 are out of this range, there is a problem in the form problem of divergence to the actual target and the light condensing property of the laser diode.

At this time, the total TTL of the laser flash according to the embodiment may be 31.5 mm, and the maximum travel distance of the second lens G2 may be 16 mm.

Here, the first lens G1, the second lens G2, and the third lens G3 may include the FDS90, and the diameters of the second lens G2 and the third lens G3 may be the same as those of the first lens 0.0 &gt; G1). &Lt; / RTI &gt; The first lens G1, the second lens G2, and the third lens G3 including the FDS90 can exhibit the following effects.

First, the first lens G1, the second lens G2, and the third lens G3 including the FDS90 have an effect of increasing the refractive index. Specifically, the greater the refractive index, the larger the radius of curvature of the lens surface to have the same refractive power, so that the aberration becomes relatively small.

Further, the first lens G1, the second lens G2, and the third lens G3 including the FDS90 have the effect of reducing the thermal dispersion. Specifically, in order to use at a wide range of use temperature conditions, a change in the refractive index depending on the temperature, that is, a small heat dispersion does not affect the performance of the laser flash due to aberration unbalancing and focal length variation depending on temperature.

The first lens (G1), the second lens (G2), and the third lens (G3) including the FDS90 have an effect of facilitating anti-reflection coating and improving durability. Specifically, as the refractive index increases, the reflection from the lens surface also becomes larger, so that the antireflection coating becomes easier, the durability of the optical thin film becomes better, the solubility to water and moisture becomes smaller, I will endure well.

The divergence angle of the laser diode 100 may be about 13 degrees at the telephoto end and about 60 degrees at the wide angle end.

Here, when the telephoto end (Tele) is 13 degrees, the central deviation with respect to the camera is reduced due to the characteristic of the flash that the condensed light is viewed from afar. In addition, when the telephoto end (Tele) is 13 degrees or less, the efficiency in operation may deteriorate, which may adversely affect the failure.

In addition, in the case of a wide angle of 60 degrees, there is a characteristic that loss of light wasted in accordance with the angle of view of the camera can be minimized. For example, the diagonal angle of view of a 12x lens is about 70 degrees.

Fig. 2 is a view showing the divergent angle of the laser flash according to the embodiment. Fig.

Referring to FIG. 2, the laser flash may be divided into Tele, Mid, and Wide depending on the position of the second lens G2.

The telephoto end Tele has a minimum distance between the first lens G1 and the second lens G2 and the wide angle end has a distance between the second lens G2 and the third lens G3 It is the minimum time. Accordingly, the second lens G2 can be divided into a telephoto end, a middle end, and a wide end according to the movement of the second lens G2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various variations and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: laser diode
G1: First lens
G2: Second lens
G3: Third lens

Claims (3)

A laser diode emitting a laser along the optical side;
A first lens disposed on one side of the laser diode and disposed on the optical side;
A second lens spaced from the first lens and disposed on the optical side; And
A third lens which is disposed on the optical side between the first lens and the second lens and moves in the direction of the first lens along the optical side or in the direction of the second lens along the optical side; Lt; / RTI &gt;
Wherein the first lens and the third lens are biconvex lenses, and the second lens is a plane convex lens. The method according to claim 1,
Wherein the first lens includes one surface (S1) and the other surface (S2)
Wherein a radius of curvature of the one surface (S1) is -14.80 mm or less at -9.50 mm or more, a radius of curvature of the other surface (S2) is at least 4.90 mm to 11.90 mm,
The third lens includes a surface (S3) and a surface (S4)
The radius of curvature of the one surface (S3) is -12.20 mm or less at a radius of curvature of -4.50 mm or more, the radius of curvature of the surface (S4) is 3.00 mm or more and 15.00 mm or less,
The second lens includes a first surface (S5) and a second surface (S6)
And the radius of curvature of the other surface (S6) is 10.20 mm or more to 12.00 mm or less. The method according to claim 1,
Wherein the first lens, the second lens, and the third lens comprise an FDS90.

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