JP3104407B2 - Light receiving parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light receiving part used for infrared remote control, optical space transmission, and the like.

[0002]

2. Description of the Related Art In recent years, regulations on the output of radiated radio waves and transmission of multiple signals have been prohibited by regulations under the Radio Law.
Radio waves are difficult to use. On the other hand, infrared light is used as an optical remote controller, and is also being used for transmitting signals such as voice.

A conventional light receiving component will be described below with reference to FIG. FIG. 7 is a diagram illustrating functions of a conventional optical transmission device. In FIG. 7, 1 is an optical transmitter, 2 is LE
D and 3 are light receivers, 4 is a light receiving element, 5 is a transmission signal, 6 is an optical signal, and 7 is a light reception signal. The transmission signal 5 is input to the optical transmitter 1 and converted into an optical signal by the LED 2. LED
The light signal 2 enters the light receiver 3 by emitting light. The light signal 6 is received by the light receiving element 4 of the light receiver 3, converted into an electric signal, demodulated by a circuit in the light receiver 3, and output as a light reception signal 7. As described above, the transmission signal 5 is transmitted as the optical signal 6 and is converted into the light receiving signal 7, thereby realizing optical space transmission.

[0004]

However, in the above-mentioned conventional method, when the distance between the transmitter 1 and the light receiver 3 increases, the amount of light incident on the light receiver 3 becomes weak, and the optical signal 6 cannot be demodulated into an electric signal. . Further, although the light receiver 3 is placed in a shield case to prevent electromagnetic noise, it has a problem that a transmission signal is deteriorated because the electromagnetic noise that jumps into the light receiving element 4 cannot be removed.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a light receiving component having a large light-collecting ability and an electromagnetic shielding effect.

[0006]

In order to solve this problem, a light receiving component according to the present invention has a flange having a flange on a flat surface side.
Two convex-planar lenses, a transparent electrode provided such that the non-conductive surface is in contact with the plane side of the convex-planar lens, and a light-receiving element provided in contact with the transparent electrode so that the central axis coincides with the convex-planar lens. A metal plate having a hole for inserting the light receiving element and a mechanism for pressing against the transparent electrode, a transparent resin is inserted between each of the lens, the transparent electrode and the light receiving element, and the metal plate and the flange of the convex flat lens are inserted. , And the metal plate and the transparent electrode are brought into contact with each other to conduct electricity.

[0007]

With the above arrangement, a large amount of light is condensed on the light receiving element by the light condensing effect of the lens, and the incidence of electromagnetic noise on the light receiving element is prevented by the light transmittance of the transparent electrode and the electromagnetic shielding effect. Can be done.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the light receiving component of the present invention will be described below.
This will be described with reference to FIGS.

In FIG. 1, reference numeral 11 denotes a convex lens, reference numeral 12 denotes a flange, reference numeral 13 denotes a transparent electrode, reference numeral 14 denotes a light receiving element, reference numeral 15 denotes a terminal of the light receiving element, reference numeral 16 denotes a metal plate, reference numeral 17 denotes a fixing claw, reference numeral 18 denotes a light receiving element pressing claw, 19 is a pressure.

The convex flat lens 11 and the flange 12 are formed by integral molding of acrylic resin. The radius of curvature R of the convex / planar lens 1 is, for example, 7 mm, the height H is 13 mm, and H / 2R
= 0.93. The transparent electrode 13 has a transparent electrode formed on a resin substrate and is sandwiched between the convex lens 11 and the metal plate 16 such that the conductive surface is in contact with the metal plate 16 serving as a shield plate. Light receiving element 1 composed of a pin photodiode or the like
Reference numeral 4 is inserted into a hole provided in the metal plate 16 and is fixed so as to be held from below by a light receiving element pressing claw 18. Fixed nail 17
Is formed by bending the metal plate 16, so that the fixed claw 1
When the flange 7 is bent so as to hang on the flange 12, the fixing claw 17 applies a pressure 19 to the flange 12, and the convex flat lens 11 is pressed and fixed by the metal plate 16. Since the transparent electrode 13 is also pressed against the metal plate 16 by the pressure 19, the contact resistance between the transparent electrode 13 and the metal plate 16 is extremely small, and both are conductive. The light receiving element 14 is fixed so as to be held by an L-shaped light receiving element pressing claw 18 and the light receiving element 14 is connected to the transparent electrode 1.
It also functions as a leaf spring that presses against 3. Although not particularly shown, a transparent resin is filled between each of the convex-planar lens 11, the transparent electrode 13 and the light receiving element 14 to reduce Fresnel reflection between the components.

Since the conductive surface of the transparent electrode 13 is conductive to the metal plate 16, when the metal plate 16 is grounded, the transparent electrode 13 is also grounded. Thus, even if the electromagnetic noise enters the light receiving element 14, the electromagnetic noise is cut off by the transparent electrode 13 and does not reach the light receiving element 14. However, the signal light is transmitted through the transparent electrode 13.
, And are photoelectrically converted by the light receiving element 14 to obtain a signal with very little noise.

As described above, the transparent electrode 13 is sandwiched between the convex / planar lens 11 provided with the flange 12 and the metal plate 16 having the holding claws 17, and the holding claws 17 are bent to form the flange 1.
By holding down 2, the conductive surface of the transparent electrode 13 can be made conductive with the metal plate 16 to block electromagnetic noise. Also,
The alignment between the convex flat lens 11 and the light receiving element 14 is performed using the metal plate 1.
This is easily done by the method shown in FIG. Further, the holding claws 17
In the same way that the flange 12 is pressed against the transparent electrode 13, the light receiving element pressing claw 18 presses the light receiving element 14 against the transparent electrode 13, so that the convex flat lens 11, the transparent electrode 13, and the light receiving element 14 are always It is in close mechanical contact.

FIG. 4 is a perspective view of a light receiving part showing another embodiment of the light receiving part of the present invention. In FIG.
The other points are the same as those in FIG. 1, and are different from the embodiment in FIG. 1 in that the flange 12 and the transparent electrode 13 are fixed to the metal plate 16 with screws 20.

When the screw 20 is used to fix the flange 12, the transparent electrode 13 and the metal plate 16, the degree of adhesion between the transparent electrode 13 and the metal plate is increased, and the metal plate 16 is firmly fixed. Further, when assembling, after the light receiving element 14, the transparent electrode 13, and the convex flat lens 11 with the flange 12 are sequentially stacked on the metal plate 16, the light receiving component can be easily assembled simply by fixing them with the screws 20. Have.

FIG. 5 is a side sectional view of a light receiving component showing another embodiment of the light receiving component of the present invention. In the figure, reference numeral 21 denotes a protrusion provided on the flange 12, reference numeral 22 denotes a silicon gel, and the other portions are the same as those in the embodiment of FIG. Fixed nail 17
When the flange 12 is pressed with the pressure, the pressure 19 concentrates on the projection 21, and the transparent electrode 13 in the portion in contact with the projection 21 is
Pressed to 6. Since the transparent silicon gel 22 has a refractive index very close to that of the convex / planar lens 11, the silicon gel 22 covers the periphery of the projection 21 to be optically uniform, thereby preventing the light condensing effect from being lowered by the projection 21. ,
Light attenuation due to Fresnel reflection at the end face of each optical component is also prevented. By providing the tip of the projection 21 with a round shape,
Even if the pressure 19 is concentrated on the projection 21, the transparent electrode 13
Will not hurt. Further, since a force is applied to the projections 21, even if the silicon gene 22 goes around between the metal plate 16 and the transparent electrode, the silicon gel 22 soaked between the transparent electrode 13 and the metal plate 16 under the projections 21 is pushed away. Then, it is pressed against the transparent electrode 13 and the metal plate 16 to maintain the state.

FIG. 6 is a side sectional view showing another embodiment of the light receiving component of the present invention. In FIG. 6, reference numeral 22 denotes the same silicon gel as the other embodiment of FIG. Other components are the same as the embodiment of FIG. When a pressure 19 is applied to the fixing claw 17, a force is applied to the glass beads 23 between the convex lens 11 and the transparent electrode 13. The force is applied to the transparent electrode 13 through the glass beads 23 and the metal plate 16.
, The conduction state is maintained. The glass beads 23 used are extremely small with a sphere diameter of about 50 microns. Since the glass beads 23 and the silicon gel 22 are transparent and have substantially the same refractive index, the portions of the silicon gel 22 and the glass beads 23 are optically uniform, and the light-collecting characteristics of the lens do not deteriorate. Even if the silicon gel 22 and the glass beads 23 wrap around between the transparent electrode 13 and the metal plate 16, the glass beads 23 have a uniform spherical diameter. When there is, the glass bead 23 between the transparent electrode 13 and the metal plate 16 directly below it moves, and the transparent electrode 13 is pressed against the metal plate 16.

As described above, by using a silicon gel containing glass beads as a matching agent, even if the silicon gel wraps between the transparent electrode and the metal plate serving as the shield plate, the silicon gel between the transparent electrode and the metal plate becomes convex and flat. It is pushed away by the pressure applied to the glass beads of the lens and the transparent electrode, and the conduction state between the transparent electrode and the metal plate is maintained.

[0018]

As described above, the present invention relates to a convex / planar lens having a flange on the flat surface side, a transparent electrode provided with a non-conductive surface in contact with the flat side of the convex lens, and The light receiving element provided in contact with the transparent electrode with the center axis coincident with the lens, and a metal plate having a hole for inserting the light receiving element and a mechanism for pressing the transparent electrode with the metal plate, the metal plate and the convex-planar lens When pressure is applied to the flange, the metal plate and the transparent electrode come into contact and conduct with each other, and can cut off the electromagnetic noise incident on the light receiving component.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a light receiving component of the present invention.

FIG. 2 is a perspective view seen from below.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a perspective view of another embodiment.

FIG. 5 is a side sectional view of another embodiment.

FIG. 6 is a side sectional view of another embodiment.

FIG. 7 is an explanatory diagram of a conventional light receiving component and an optical transmission device using the light receiving component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Convex lens 12 Flange 13 Transparent electrode 14 PD (pin photodiode) 16 Metal plate 17 Fixing claw 18 Light receiving element holding claw 19 Pressure 20 Screw 21 Projection 22 Silicon gel 23 Glass bead

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-74720 (JP, A) JP-A-3-110329 (JP, U) JP-A-1-73956 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) H01L 31/02-31/0236

Claims (6)

(57) [Claims] 1. A convex / planar lens having a flange on a plane portion side, a transparent electrode provided such that a non-conductive surface is in contact with the plane side of the convex / planar lens, and a central axis coincident with the convex / planar lens. A light-receiving element comprising a light-receiving element provided in contact with the transparent electrode, a hole for inserting the light-receiving element, and a metal plate integrally connecting the convex / planar lens, the transparent electrode and the light-receiving element. 2. A folded portion is provided on a part of the metal plate, and the folded portion presses a flange of the lens.
The light receiving component described. 3. The light-receiving component according to claim 1, wherein the metal plate and the flange of the lens are fixed by screws. 4. The light receiving component according to claim 1, wherein a transparent resin is inserted between the convex flat lens, the transparent electrode film and the light receiving element. 5. The light-receiving component according to claim 1, wherein at least one projection is provided on a flat portion of the convex-planar lens, and a transparent resin is filled between the transparent electrode and the convex-planar lens. 6. The light receiving component according to claim 1, wherein a transparent resin containing glass beads is inserted between the convex flat lens and the transparent electrode.