JP4154061B2 - Ranging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a distance measuring device, and more particularly to improvement of a holding member of a light receiving sensor mounted thereon.
[0002]
[Prior art]
Conventionally, a semiconductor position detecting element (PSD) or a solid-state image sensor (CCD) is used as a light receiving sensor in a distance measuring device or a focus adjusting device. Further, as a package of these light receiving sensors, a sensor chip covered with glass and a resin material is well known.
[0003]
FIG. 4 is a diagram illustrating a configuration example of a passive distance measuring unit. In the figure, 401 is a light receiving lens, 402 is a distance measuring block for holding the light receiving lens 401 and a light receiving sensor 403, which will be described later, and 403 is a package in which the sensor chip is covered with translucent glass and a resin material. It is the comprised light reception sensor. The light receiving sensor 403 is a photoelectric conversion element such as a CCD, and is mounted on a flexible substrate 404. The flexible substrate 404 connects the light receiving sensor 403 and a control device (not shown).
[0004]
The light receiving lens 401, the distance measuring block 402, the light receiving sensor 403, and the flexible substrate 404 constitute a distance measuring unit.
[0005]
In general, in this type of distance measuring unit, the position accuracy is improved by adjusting the position of the light receiving sensor 403 so as to match the optical axis of the light receiving lens 401. Further, in FIG. 4, reference numeral 405 denotes an adjustment tool (a part of which is shown) for performing such position adjustment. The pins 405 a and 405 b are inserted into the notches at both ends of the light receiving sensor 403 to receive light. The sensor 403 is fixed to the tool 405 to adjust the position. This position adjustment is performed in the directions of arrows X, Y, and θ in the figure.
[0006]
After the position of the light receiving sensor 403 is properly adjusted, the light receiving sensor 403 is adhered to the distance measuring block 402 in the state as it is. In this case, for example, an instantaneous adhesive mainly composed of cyanoacrylate is used, and then the adjustment tool 405 is detached from the light receiving sensor 403 to complete the position adjustment.
[0007]
More recently, for the purpose of reducing the size of the package, a TAB (Tape Automated Bonding) tape is bonded to one surface of the light-transmitting glass with an adhesive, and the other side of the TAB tape is anisotropically guided. A light receiving sensor is known in which electrode pads of a CCD chip are electrically connected through a film (Japanese Patent Laid-Open Nos. 7-99214, 7-183329, 10-74923, etc.). (Hereinafter, this light receiving sensor structure package is referred to as a TOG (TAB On Glass) package).
[0008]
5A and 5B are perspective views showing a configuration example of the light receiving sensor in the above-described TOG package. FIG. 5A is a view from the glass surface direction, and FIG. 5B is a view from the chip surface direction. In FIG. 5, reference numeral 501 denotes a translucent glass, 502 denotes a TAB tape, and 503 denotes a CCD chip. The TAB tape 502 and the glass 501 are bonded by an adhesive, and the electrode pads of the TAB tape 502 and the CCD chip 503 are electrically connected through an anisotropic conductive film. Further, as shown in FIG. 5B, in this light receiving sensor, pattern wiring is performed from an electrode pad (not shown) of the TAB tape 502 and connected to a control system (not shown) via this wiring.
[0009]
[Problems to be solved by the invention]
However, in the conventional light receiving sensor, particularly in the case of the light receiving sensor shown in FIG. 5, it is substantially provided in the TAB tape with a notch or a hole (see FIG. 4) for holding the light receiving sensor as described above with a tool. Is difficult. That is, pattern wiring is applied to the TAB tape. Therefore, when a holding space for a tool such as a notch is provided on the TAB tape, the entire package must be enlarged in order to avoid pattern wiring and avoid disconnection.
[0010]
Moreover, even if a notch for holding the TAB tape with a tool can be provided, the material of the TAB tape is a soft material such as polyimide, so the stability when holding the TAB tape with a tool. Becomes worse and the adjustment accuracy becomes substantially coarse.
[0011]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a distance measuring device that enables appropriate and effective position adjustment.
[0012]
[Means for Solving the Problems]
Distance measuring apparatus according to the present invention includes a light receiving lens for condensing reflected light from the distance measuring object and a light receiving sensor configured by a light receiving element which is condensed light is imaged, the output of the light receiving sensor A distance measuring device that measures the distance to the object to be measured by
As the positioning reference back side of the light receiving element, said comprising: a holding member for holding the light-receiving sensor, and a distance measuring block capable abut against the holding member from the back holding the light receiving lens,
At both ends of the holding member, two holes are formed for holding the light receiving sensor from the back side by an adjustment tool when adjusting the position of the light receiving sensor with respect to the optical axis of the distance measuring lens. The light receiving sensor can be moved in a rotational direction and a parallel direction with respect to the light receiving sensor surface in a state where the adjustment tool is attached to the formed hole,
The light receiving element and the holding member are bonded by an adhesive, and a TAB tape is bonded to one surface of the holding member, and the surface opposite to the bonding side of the TAB tape is interposed through an anisotropic conductive film. The TAB tape and each electrode pad of the light receiving element are electrically connected .
[0014]
In the distance measuring device according to the present invention, the light receiving element is a solid-state imaging element.
In the distance measuring device of the present invention, the light receiving element is a semiconductor position detecting element.
[0015]
[Action]
According to the present invention, the chip back surface of the light receiving sensor is received by the holding member, and this portion is bonded by the adhesive. As a result, when the light receiving sensor is adjusted to an appropriate position with respect to the optical axis of the light receiving lens, the adjustment tool holds the light receiving sensor via the holding member, so that the light receiving sensor remains small and precise. Adjustment is possible.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a distance measuring device according to the present invention will be described using the same reference numerals for members that are substantially the same as or correspond to those of the conventional example, with reference to the drawings.
FIG. 1 is a perspective view showing a light receiving sensor and a holding member for holding the light receiving sensor according to the present embodiment. The light receiving sensor according to this embodiment is an example of a light receiving sensor using a CCD chip as a light receiving element.
[0017]
In the figure, reference numeral 1 denotes a light receiving sensor, which is configured as the already-described TOG package. In FIG. 1, the light receiving sensor 1 is viewed from the back side of the CCD chip, and the protruding portion of the light receiving sensor 1 corresponds to the CCD chip 2. In the light receiving sensor 1, a TAB tape is bonded to one surface of a light-transmitting glass with an adhesive, and the TAB tape and the CCD chip 2 are disposed on the opposite surface of the TAB tape via an anisotropic conductive film. Each electrode pad is electrically connected.
[0018]
Reference numeral 10 denotes a holding member for the light receiving sensor 1, and the hatched portion A of the light receiving sensor 1 is received by the hatched portion B (concave surface) of the holding member 10 and bonded by an adhesive.
[0019]
Two holes 10 a and 10 b are formed at both ends of the holding member 10. These holes 10a and 10b are used for holding the light receiving sensor 1 by pins attached to the adjustment tool as will be described later when the light receiving sensor 1 is adjusted to an appropriate position with respect to the optical axis of the distance measuring lens. Used for.
[0020]
Here, FIG. 2 is a diagram for explaining the position adjustment process of the light receiving sensor 1. In FIG. 2, 401 is a light receiving lens for distance measurement, 402 is a distance measuring block to which the light receiving lens 401 is attached, 405 is an adjustment tool for adjusting the position, and has pins 405a and 405b at both ends. Yes. These members and the like are substantially the same as those described above (see FIG. 4). 2, the holding member 10 is attached to the light receiving sensor 1 as described above.
[0021]
In the position adjustment of this embodiment, the two pins 405 a and 405 b of the adjustment tool 405 are inserted into the holes 10 a and 10 b of the holding member 10 attached to the light receiving sensor 1 to hold the light receiving sensor 1. Next, the adjustment tool 405 is moved so that the held light receiving sensor 1 abuts the distance measuring flock 401. In this state, the adjustment tool 405 is moved in the X, Y, and θ directions in the drawing so that the light receiving sensor 1 is at an appropriate position with respect to the optical axis of the distance measuring lens, and thereby the position is adjusted.
[0022]
After the position of the light receiving sensor 1 is properly adjusted, the distance measuring block 402 and the light receiving sensor 1 are bonded with an adhesive, and when fixed, the adjustment tool 405 is pulled out from the light receiving sensor 1 to complete the position adjustment of the light receiving sensor 1.
[0023]
Here, whether or not the adjustment position of the light receiving sensor 1 is good is determined by placing a reference chart (not shown) at a position away from the distance measuring block 402 by a predetermined distance on the optical axis of the light receiving lens 401. Judgment is made based on the output state. Here, for simplicity, an electrical connection diagram from the light receiving sensor 1 is omitted.
[0024]
As described above, the holding member 10 is assembled to the light receiving sensor 1 and the positioning is stabilized, thereby realizing highly accurate position adjustment.
[0025]
In the description of the above embodiment, the shape of the holding member 10 is simplified. However, the holding member is shaped as shown in FIG. 3, and the hatched portion C in the drawing is a receiving surface with the distance measuring flock 402 in FIG. It can also be.
In the above embodiment, an example of a CCD as a light receiving sensor has been described. However, the present invention is not limited to this, and the distance measuring method may be a PSD used in an active distance measuring device using the principle of triangulation. .
[0026]
【The invention's effect】
As described above, according to the present invention, in this type of distance measurement, the back surface of the chip of the light receiving sensor is received by the holding member, and this portion is bonded by the adhesive. When adjusting the light receiving sensor to an appropriate position with respect to the optical axis of the light receiving lens, the adjustment tool holds the light receiving sensor via the holding member, so that the light receiving sensor can be precisely adjusted while keeping the size small. Become.
[Brief description of the drawings]
FIG. 1 is a perspective view of the outer shape of a light receiving sensor and a holding member according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating position adjustment of a light receiving sensor according to an embodiment of the present invention.
FIG. 3 is a perspective view of an outer shape for explaining a modified example of the holding member.
FIG. 4 is a perspective view of an outer shape explaining a TOG package.
FIG. 5 is a diagram illustrating position adjustment of a light receiving sensor in a conventional package.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light reception sensor 2 CCD chip 10 Holding member 10a, 10b Hole 401 Light reception lens 402 Distance measuring block 405 Adjustment tool 405a, 405b Pin

Claims (3)

A light receiving lens for condensing reflected light from the distance measuring object, and a light receiving sensor configured by a light receiving element which is condensed light is imaged, the distance to the object by the output of the light receiving sensor A ranging device designed to measure,
As the positioning reference back side of the light receiving element, said comprising: a holding member for holding the light-receiving sensor, and a distance measuring block capable abut against the holding member from the back holding the light receiving lens,
At both ends of the holding member, two holes are formed for holding the light receiving sensor from the back side by an adjustment tool when adjusting the position of the light receiving sensor with respect to the optical axis of the distance measuring lens. The light receiving sensor can be moved in a rotational direction and a parallel direction with respect to the light receiving sensor surface in a state where the adjustment tool is attached to the formed hole,
The light receiving element and the holding member are bonded by an adhesive, and a TAB tape is bonded to one surface of the holding member, and the surface opposite to the bonding side of the TAB tape is interposed through an anisotropic conductive film. A distance measuring device , wherein a TAB tape and each electrode pad of the light receiving element are electrically connected . The distance measuring device according to claim 1 , wherein the light receiving element is a CCD. The distance measuring device according to claim 1 , wherein the light receiving element is a semiconductor position detecting element.

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