JPS60256123A - Optical deflector - Google Patents

Abstract

PURPOSE:To utilize heat energy effectively and to obtain a large angle of deflection with low electric power by providing a heat conducting member which forms a heat conduction path between a heat element and a surface of an optical material which corresponds to the propagation part of a light beam. CONSTITUTION:A heat radiation fin 3 is fitted onto the top surface of a rectangular-prism crystal of lithium niobate which varies in refractive index with temperature across the heat conducting member 4 for stopping down heat flux, and the heating body 2 is fitted to the reverse surface through the heat conducting member 4. The heating body 2 is formed of, for example, Ni-Cr by vacuum deposition. Therefore, heat generated by the heating body 2 is conducted concentrically to the center part of the crystal 1. Consequently, a relatively large temperature gradient is formed at the center part in the crystal 1, so the heat energy is utilized effectively to obtain the large angle of deflection with low electric power.

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND OF THE INVENTION This invention relates to an optical deflector using an optical material whose refractive index changes depending on temperature.

1- Glass 1. m is the 11iIn rate of the dielectric material, etc., is the temperature (
, 2J, is known to change. This J, ゛) temperature optics 9) + optical material 114 with the east side 14 (it is possible to deflect the light 1, in order to change the temperature of the optical material, N1Gr on the surface) nato's ft heat 1
4. It is worth 1 to set up \ Ziperub 1 soryo.

Figures 5, J, and 0 show six 1u optical effects for one product A'
An example of an optical deflector using the 4th grade amulet will be shown below.

A heating element (2), such as Ni□r, is formed on the lower surface of a dielectric crystal having a thermo-optical effect, such as a crystal (]) of sodium dibutate (1:Nb03). Crystal〈1
)'s '- side has a bold fin (3).

When a current is passed through the heating element (2) through the power source (path shown) at J, 7), the heating element (2) generates heat, and the top surface of the crystal -9- (1) is heated. Heat is conducted as shown by the arrow JJ, within the surface of the sea urchin crystal (1), and -1 of the crystal (1)
The heat is then diffused into the air via the RUIJ heating fins (3). In addition, an upward temperature gradient J occurs within the crystal (1) (Due to this lfj degree gradient), a refractive index gradient occurs within the crystal (1). Crystal number 1): A beam of light △ from the center of crystal 1) to the 1-bottom surface of crystal number 1! ? -J, the light beam l\ is deflected upward, in this example downward, due to the gradient of the l1ii JJi rate. The deflected and output q·1 light beam is indicated by B.

In this optical deflector, the light beam l\ propagates in the center of the width within the crystal (1), while the heat emitted by the light/l to the heating element (2) is distributed throughout the entire part of the crystal (1). (It heats up evenly,'
9, there is a problem that a lot of heat energy is wasted and the deflection angle of the red beam is relatively small.

About the invention This invention (i. Effective use of 1 liter of heat) was developed to develop an optical deflector that can obtain a relatively low power C ratio axial angle L deflection angle. Flu iJ and so on.

In accordance with this invention, the optical deflector 1 (, im A1 (, -)
, ->< II + 11114t is a change in the optical material and 6 - on the surface 1, the optical material is heated; In the above, on the surface of 1. optical + A Fl,
λ in the (mu history part) of the light beam in the optical + A tl
I, i5 The heat transfer part forming the heat path is installed between the surface part of the heat absorption surface and the heat absorption surface. Sign and J.

慇１α Optical Effect Song Dynasty -) Representative 'fb' of Optical Monthly -
3- Toshi U 11, glass, Ti Q2, l-i N
boa, r) 17 T, etc. Optics 4A r+1
As hot water for heating or cooling, there are heating elements such as Ni-0 and I-i, and pers.

The size of the heat absorbing surface of the valve heat of the thermal system Y is often the same as the size of the surface of the optical 4N II on which the thermal element is installed, or the size of each 1 meter 1-. .

In the optical deflector according to this invention, optical materials (41
A heat transfer path is formed between the surface portion corresponding to the propagation portion of the light beam in 1 and the entire heat generating or endothermic surface of 1.
Since the heat transfer member is provided, the surface portion M corresponding to the propagation portion of the light beam in the optical material itl on the surface of the optical material is heated or cooled via the heat transfer member. Therefore, the heat is concentrated in the propagation part of the light beam in the optical material 11. Therefore, the heat is System r1.: J, Tsuteha 11 Netsuma I Koha i'+
i Compared to the case of IJI, optical (light within January -1
Ino (1, relatively thick r, f product gradient is formed in the conveyance part, and this temperature 1 μ gradient is relatively thick r I
++l lli rate gradient F11! /) < til the deflection angle is increased by 1q to make it relatively thick. From this point, we can also reduce the current supplied to the thermal element and compare it to b.
It is assumed that r Ili direction angle is jIt, and I1 (power optical deflector is realized).

The heating surface of the thermal element is 1ν, and the thermal surface is J31J on the surface of the optical +A II.
) corresponding to the surface portion J, when the sushi person is (well, in this invention J, in the optical deflector, the heat generation of the thermal system -r, 1, /Jt
, L Heating generated on the entire endothermic surface, L /Jμ Heat for cold JJI [J' to the surface of the optical material i+:+]
The propagation portion of the light beam within the optical material 1'l can be heated and effectively utilized by iθIJI channel 1.

-(1- Description of Embodiment Figures 1 and 2 show a first embodiment of the present invention.
There is. Radiation fins (3) and heating elements (2) are attached to the upper and lower surfaces of a rectangular crystal (1) of di-Δsodium butyl oxide through copper heat flow restricting heat transfer members (4), respectively. It is set up. The lower heat transfer section +J (/l) has a rectangular cross section and is formed into a hexahedron that extends upward (the cross section of the center is less crowded. This heat transfer section +J (/1 )
The length of the upper surface of is almost equal to the length of crystal (1),
Its width is slightly longer than the diameter of the light beam (this length is smaller than the width of the crystal (1)). The upper surface of the heat transfer member (4) is fixed to the width center portion of the lower surface of the crystal (1). The heating element (2) is this heat transfer part vU
(/I) is formed on the entire lower surface. The heating element (2) is formed by vacuum-depositing NiCr on the first surface of the heat transfer member (71).

- The heat flow constrictor heat transfer part +A on the side (4) is a rectangular shape with the heat transfer member (/I) on the side 1-1 opposite to 1-10,
The lower surface of the groove is fixed to the center of the width of the crystal (1). One side metal body of this heat transfer member (/I) [this heat dissipation fin (
3) is set up (3° heating element 2), heat is generated (4, (2) is heated. Heat transfer part +A for heat flow restriction (/
The heat transferred to the center of the width of the lower surface of crystal (1) is transmitted to the center of the width of the lower surface of crystal (1).
The center width of the crystal (1) is placed inside the crystal (1) and conducts from the center of the width of one side of the crystal (1) to the heat flow restriction heat transfer member (/1) on the 1- side to form a b'l thermal twin (3 ) into the air via /+9
be defeated. The heat generated by the heating element (2) -/- in this J,') is transmitted to the center of the width of the upper surface of the crystal (1) by the heat transfer member (4) on the 1 side, and 7
I), the heat is radiated from the center of the width of the top surface of the crystal (1), so the heat generated in the heating element (2) is conducted intensively to the center of the width of the crystal (1). Ru. KonataV)
, a relatively large temperature gradient is formed at the center width inside the crystal (1), and this temperature gradient forms a relatively large refractive index gradient.

Therefore, the light beam A from the center of the width of the end face of the crystal (1)
When the light beam enters parallel to the plane fixed to the crystal (1) of the shrine (4), the light beam will be directed downward as it travels through the crystal (1) due to the refractive index gradient. It is deflected relatively largely and is exposed at 8 from the other end surface. The relatively large deflection of the light beam means that the lightning current to the heating element (2) is small, taking into account that the plane angle is increased. A power optical deflector is realized.

Figures 3 and 4 (showing the second embodiment of the present invention + Kl. In this optical deflector, Cb is used for heat flow restriction on the 11-face of the crystal (1) as in the first embodiment. Parts (/l
) are respectively installed (3° heat flow restricting river heat transfer part +
The shape 4) of 4</I) is the same as the shape of the heat transfer member (4) for heat flow restriction of the first embodiment (, 1), but the 1 end of the side surface and the + (++ (J is formed on the vertical surface instead of ・), (difference between b and throat in the first embodiment is 4f-)
) is provided on the plane of the heat flow comparison V of σ1111 tz + heat section vU (/l), respectively.

Bellburi's completion (艷) is J, well-known (J, ゛1*n -), and there is a T body (7) in the shape of a power transmission between a pair of heat exchanger plates (6).
are assembled into at least one assembly (J), and these 1'4 bodies (7) are fixed to the heat transfer 1fj (6) and connected 414 (
J, -, ) (J where P type and N type intersect lj
, 60'C are connected in series.゛A direct current is passed through the power supply (body) and a pair of heat exchanger plates (3) and the other heat exchanger plate (6) receives heat through /l, 1output 1j (f:
Heat absorption +15 to heat transfer number (6)! happens.

When the direction of the current is reversed, the heat exchanger plate (
6) , t, the heat exchanger plate (6) where heat ltl>contraction occurs is oppositely 4[. (The outer surface of the heat-generating surface (6) is the heat-generating and endothermic surface.Each bell f + elemental heat (5) (well, -/'r's one heat root (
6) The heat transfer part 4.4 for heat flow restriction whose light heat absorption surface is on the 1- side
(4) 1 side s1'' or side heat flow constrictor heat transfer part +4
It is fixed to the heat section +4 (4) in close contact with the soil surface (for each heat flow comparison). Each verdir is -1
” (!-1) Noll!!jJノfieAOz (E
: ) r/) 111 is boldly displayed on the qpalN2Pla side.
&Thermal fin (3) is injected.

1 side Pel f 1 prefecture 1'' (5)) heat flow comparison number')■(
J, current is passed from the heat source 1 (not shown) to this bell 1 element r (5) on the heating part 44 (4) side ((i > l2 heat generation 1!) , 1 side bell f+A, r
Heat flow on the heat transfer part shrine (4) side + lx (6)
1 causes heat absorption u6J, and when a current flows from the uniden i・For side heat flow restriction (I
, the heated part (/I) is heated by I+11, and thereby the central part of the width of the opposite side of the crystal (1) is heated. ”1
The heat transfer member (4) for restricting the heat flow on the side is cold-injected to the bell belt I rope (5) on this side, and the center of the width of one side of the crystal (1) is placed on this side. Part/)~7?77. II. Since the heat is concentrated at the center of the width of the crystal (1), there is a relatively large temperature gradient in the center of the width of the crystal (1). is emitted (1, and this temperature is J,
-) (A relatively large Ih index gradient is formed. Therefore, the light beam l\△ entering from the center of the width of the end face of the crystal (1) travels through the crystal (1) through the process of It is deflected relatively largely toward the hand, and is exposed from the other end surface to the direction shown by J.

This optical internal device has the advantage that it can be deflected in the l-direction by reversing the direction of the current flowing through each perdil element. Deflected in the l-direction, I comes out q
1 light beam accepted at 132-6

[Brief explanation of the drawing]

FIGS. 1 and 2 show a first embodiment of the present invention,
Figure 1 is a side view, Figure 2 is a front view, Figures 3 and 4 are
The figures show a second embodiment of the present invention.
) Figure 50 Figure 6 'L! ! IA stone J, -) (bli
lli'? ' is changed by using the optics 4/It'l.
1 Figure 1.1 d-plane view (optical reading to Aro 1゜(1)...dirty) 9-body crystal, (?)...heating element, (4)...heat flow aperture river heat transfer Ra+ 44,〈 ;))... Bell f + Soryo 5, so 1 14- Figure 1\ 2nd cause

Claims (1)

[Claims] In an optical deflector, a thermal element for heating or cooling the optical material is provided on at least one surface of the optical material whose refractive index changes with temperature. A heat transfer member that forms a heat transfer path is installed between the surface portion corresponding to the propagation portion of the light beam within the optical moon and the entire heat generating or heat absorbing surface of the thermal element. light deflector.