JP3221353B2 - Optical recording element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording element in which two light emitting dot rows are arranged in parallel. INDUSTRIAL APPLICABILITY The optical recording element of the present invention is useful as a light source for a printer that can be used for recording means such as a video printer, an electrophotographic printer, a label printer, and a silver halide printer.

[0002]

2. Description of the Related Art An optical recording element 10 proposed by the present applicant.
0 will be described with reference to FIGS. As shown in FIG. 6, the optical recording element 100 has an envelope 5 in which an anode substrate 2, a side plate 3, and a back substrate 4 are assembled in a box shape with sealing glass. The inside of the envelope 5 is in a high vacuum state.

As shown in FIG. 5, on the inner surface of the anode substrate 2, along the longitudinal direction of the anode substrate 2, there are first and second light emitting dot rows 7, each comprising a plurality of light emitting dots 6. 8 are provided. Each light emitting dot 6 has a frame-shaped conductive film such as aluminum formed on the anode substrate 2 and a phosphor layer applied on the frame-shaped conductive film. The first and second light emitting dot rows 7, 8 are arranged at predetermined intervals in a direction orthogonal to the longitudinal direction of the substrate. The positions of the light emitting dots 6 of the first and second light emitting dot rows 7 and 8 do not match in the longitudinal direction of the substrate. That is, in the light emitting dots 6 of both light emitting dot rows 7 and 8, the light emitting dots 6 and 6 adjacent between the rows are arranged in a staggered manner. The two adjacent light emitting dots 6, 6 between the first and second light emitting dot rows 7, 8 are commonly connected by anode wiring, respectively, and the anodes are connected to one side of the two light emitting dot rows 7, 8 respectively. Wiring 9
Is derived.

[0004] The optical recording element 100 is a dynamic drive. As shown in FIG. 5, two adjacent light emitting dots 6, 6 of the first and second light emitting dot rows 7, 8 are connected,
As shown in FIG. 6, each of the anode wires 9 is drawn out of the envelope 5 by the anode wiring 9 on the anode substrate 2.

As shown in FIG. 5, a flat control electrode 11 is provided on the upper surface of the anode substrate 2. The plane control electrode 11 is made of a conductive film such as aluminum, and is provided on the same plane as the light emitting dots 6 so as to surround the light emitting dots 6 and the anode wiring 9. At the time of driving, a positive voltage is always applied to the plane control electrode 11 to keep the electric field in the vicinity constant.

[0006] As shown in FIG. 4 and FIG.
, The first and second light emitting dot rows 7, 8
Above each of the light emitting dot rows 7 and 8 (the first
The first cathode 12 and the second cathode 13 in the form of filaments are respectively stretched. On the inner surface of the back substrate 4, a Nesa film 14, which is a light-transmitting conductive film for antistatic, is formed.

As shown in FIGS. 4 and 5, between the first light emitting dot row 7 and the second light emitting dot row 8, a shielding electrode 2 is provided.
0 is provided. The shielding electrode 20 is a plate-shaped electrode member, and is installed substantially perpendicular to the anode substrate 2. The lower end faces the surface of the anode substrate 2 at a predetermined minute interval (about 0.3 mm in this example). The upper end of the shield electrode 20 is located above the positions of the first and second cathodes 12 and 13 to prevent electrons emitted from the cathodes 12 and 13 from flowing across the shield electrode 20 to the opposite side.

The first control electrode 3 is provided in the space on the side where the first cathode 12 is disposed with respect to the shield electrode 20.
0 is provided. A second control electrode 31 is provided in a space on the side where the second cathode 13 is disposed with respect to the shielding electrode 20. Each control electrode 30, 31
Is a plate member having a substantially L-shaped cross section when viewed in a plane orthogonal to the first direction, and a flange plate portion horizontal to the anode substrate 2 is arranged parallel to the surface of the anode substrate 2. The flange plate portion of the control electrode is located above the anode substrate 2 at a small interval (about 0.5 mm in this example). Both control electrodes 30, 3
The upper end of 1 is located above the cathodes 12 and 13. That is, the cathodes 12 and 13 are surrounded by the shielding electrode 20 and the control electrodes 30 and 31. In this example, each cathode 1
Reference numerals 2 and 13 denote control electrodes 3 corresponding to the shielding electrodes 20.
It is arranged approximately midway between 0 and 31.

The operation of the optical recording element 100 will be described.
The first and second cathodes 12 and 13 are always energized and emit electrons. Zero or positive voltage is always applied to the shielding electrode 20. A positive voltage is always applied to the plane control electrode 11. A set of two adjacent light emitting dots 6, 6 of the first and second light emitting dot rows 7, 8 is sequentially driven. The first and second control electrodes 3 are synchronized with the scanning of each light emitting dot 6.
A selection signal is applied to 0 and 31. For example, when a positive voltage is applied to the first control electrode 30 in synchronization with the scanning timing of the light emitting dot row, a negative voltage is applied to the second control electrode 31. First control electrode 3 to which a positive voltage is applied
Electrons enter between 0 and the shielding electrode 20 and emit light when the electrons strike the light emitting dots 6 to which the drive signal of the first light emitting dot row 7 is given. Electrons are blocked by the electric field between the second control electrode 31 to which the negative voltage is applied and the shielding electrode 20, and no electrons enter the second light emitting dot row 8. do not do.

Since the upper end of the shield electrode 20 is higher than the cathodes 12 and 13, electrons are prevented from flowing into the side where light is not emitted. By the shielding electrode 20 to which the positive voltage is applied,
The influence of the potential of the control electrode to which the negative voltage is applied does not affect the light emitting side where the positive voltage is applied to the control electrode, and the light emitting dot 6 on the side where the positive voltage is applied to the control electrode is selected. It emits light. The light emitted from the light emitting dots 6 is applied to the front of the anode substrate 2 through the translucent anode conductor and the anode substrate 2.

[0011]

FIG. 7 is an enlarged view showing the structure of the end of the shielding electrode 20. As shown in FIG. An insulating layer 40 is formed on the upper surface of the anode substrate 2 so as to surround the elongated, substantially rectangular display area in which the light emitting dot rows 7 and 8 are provided. An end of the shield electrode 20 is fixed to a frame 50 disposed on the insulating layer 40. The frame 50 is a band-shaped metal member having a longitudinal direction orthogonal to the longitudinal direction of the shield electrode 20, and is hermetically penetrated through the sealing portion of the envelope 5 and is led out of the envelope 5. Shielding electrode 2
Both ends of 0 are supported by such a structure. In FIG. 7, reference numerals 51 and 52 denote the control electrodes 30, 31.
These frames 51 and 52 are also disposed on the insulating layer 40, and the ends thereof are led out of the envelope 5.

As described above, both ends of the shield electrode 20 are connected to the frame 50 mounted on the insulating layer 40 formed on the anode substrate 2, and thus the shield electrode shown in FIG. The minute interval t (about 0.3 mm in the above example) between the electrode 20 and the anode substrate 2 was determined by the thickness of the insulating layer 40 and the frame 50.

However, since the insulating layer 40 is formed by a thick-film printing method, it is not easy to precisely set the thickness of the insulating layer 40, and therefore, the distance between the shield electrode 20 and the anode substrate 2 is difficult. It has been difficult to always set t to the expected value. In some cases, the interval t is equal to the target 0.
It may exceed 3 mm. In such a case, the electric field generated by the control electrode to which a negative voltage is applied affects the adjacent light emitting dot row from the gap, and the selected light emitting dot row does not emit light due to the negative potential. Sometimes it happened.

In order to precisely set the gap, an insulating layer may be provided at a position other than both ends of the shield electrode 20 to support the shield electrode 20. However, the position other than both ends of the shielding electrode 20 is a display area where the light emitting dot rows 7 and 8 are provided. Occurs. Therefore, it is not preferable to adopt a structure in which an insulating layer is provided in the display region to support the shield electrode 20.

According to the present invention, there are provided two light emitting dot arrays formed on an anode substrate, two filament cathodes provided for each light emitting dot array, a central shielding electrode for driving the light emitting dots, and both side electrodes. In an optical recording element having a control electrode, an object is to set a distance between the shielding electrode and the anode substrate to a constant value.

[0016]

According to a first aspect of the present invention, there is provided an optical recording element comprising: an envelope whose inside is in a high vacuum state; and an inner surface of an anode substrate which is a part of the envelope. A plurality of light emitting dot rows composed of a plurality of light emitting dots, a control electrode provided along each of the light emitting dot rows on the outside of each of the light emitting dot rows, and a space between the two light emitting dot rows. A shielding electrode provided along the light emitting dot row at a predetermined distance from the anode substrate, and a filament cathode provided along each of the light emitting dot rows above each of the light emitting dot rows, In the optical recording element having the shielding electrode, both ends are fixed to a frame on an insulating layer provided on the anode substrate, and a projection is formed at an inner bottom portion of the both ends to contact the surface of the anode substrate. It is characterized by having done.

According to a second aspect of the present invention, there is provided the optical recording element according to the first aspect, wherein the projecting portion is formed of the second optical recording element.
The present invention is characterized in that it is in contact with the anode substrate in a region where there is no anode wiring connecting the light emitting dots of the column.

An optical recording element according to a third aspect is the optical recording element according to the first aspect, wherein the height of the shielding electrode is higher than that of the cathode.

According to a fourth aspect of the present invention, in the optical recording element of the first aspect, the control electrode is insulated from the anode substrate, and has a height higher than that of the cathode. It is characterized by.

According to a fifth aspect of the present invention, there is provided the optical recording element according to the first aspect, wherein the luminescent dots are:
A scanning signal is sequentially applied to each of two light-emitting dots adjacent in a staggered manner between the two light-emitting dot rows, and a positive voltage is always applied to the shielding electrode, and is synchronized with the scanning of the light-emitting dots. Thus, a positive selection voltage is applied to one of the two control electrodes, and a negative non-selection voltage is applied to the other.

[0021]

[0022]

1 to 3 show an embodiment of the present invention.
This will be described with reference to FIG. The structure of the optical recording element 1 of this embodiment has some parts in common with the optical recording element 100 described in the section of the prior art proposed by the present applicant. Fig. 4 ~
The same reference numerals as those in FIG. 7 denote the same parts, and a description thereof will be omitted.

As shown in FIGS. 1 and 2, on the upper surface of the anode substrate 2, there are two light emitting dot rows 7 and 8 composed of a large number of light emitting dots arranged in a staggered manner. An insulating layer 40 is formed on the upper surface of the anode substrate 2 so as to surround the display area where the light emitting dots 7 and 8 are formed. As shown in FIG. 1, the ends of the shield electrode 60 and the two control electrodes 30, 31 are connected to different frames 50, 51, 52, respectively, and the frames 50, 51, 52 are spaced apart from each other. It is arranged on the insulating layer 40.

As shown in FIG. 1 and FIG.
A protrusion 61 protruding toward the anode substrate 2 is formed at the end of the substrate. The protrusions are at both ends of the shield electrode 60. As shown in FIG. 3 in an enlarged manner, the protrusion 61 of this example is substantially semicircular.

As shown in FIG. 1 and FIG.
Is provided at a position outside the display area where the light emitting dot rows 7 and 8 are located, and is in direct contact with the surface of the anode substrate 2 at a portion where the insulating layer 40 is not provided.

The shield electrode 60 of the present embodiment is not in a state of being bridged between the insulating layers 40 on both sides as in the optical recording element 100 proposed by the present applicant earlier described in the prior art.
Both ends contact the surface of the anode substrate 2 and are securely held. Therefore, the gap between the shield electrode 60 and the anode substrate 2 in the display region is set precisely to an expected value even if the thickness of the insulating layer 40 and the like vary. Therefore, it is possible to reliably prevent the inconvenience that the potential of the control electrode on the non-selection side affects the light emitting dot row on the selection side from below the shielding electrode 60.

As described above, since the projection 61 is provided so as to avoid the display area, there is no possibility that the shielding electrode 60 comes into contact with the light emitting dot rows 7, 8 and the wiring of the flat control electrode 11. Also, a portion without the anode wiring may be formed in the display region, and the protrusion may be brought into contact therewith.

As described above, the shape of the protrusion 61 is semicircular, and the lower end portion of the round portion comes into contact with the anode substrate 2, so that the contact state is stable despite the point contact. Therefore, even if the thickness of the frame 50 or the insulating layer 40 varies slightly, or if the shape of the metal member or the thickness of the insulating layer 40 changes in a heating process or the like in the manufacturing process of the optical recording element 1, the shielding does not occur. The distance between the electrode 60 and the anode substrate 2 can be reliably kept constant.

However, the shape of the projection does not necessarily have to be semicircular as in the present embodiment, and other shapes can be adopted according to conditions. For example, a shape having a sharp tip such as a triangle may be substantially in contact with the anode substrate 2 at a point, or a rectangular or trapezoidal shape may provide a certain effect. In short, any material can be used as long as it can contact the surface of the anode substrate 2 and reliably determine the position of the shielding electrode 60.

[0030]

According to the optical recording element of the present invention, two light emitting dot rows formed on the anode substrate, two filament cathodes provided for each light emitting dot row, and light emitting dots are driven. In an optical recording element having a central shielding electrode and control electrodes on both sides, the shielding electrode has both ends fixed to a frame on an insulating layer provided on the anode substrate, and is provided on an inner bottom of the both ends. Since the protruding portion is formed in contact with the surface of the anode substrate, the distance between the shield electrode and the anode substrate can be kept constant even if the thickness of the insulating layer and the frame have some variation.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view showing the vicinity of an end portion of an anode substrate according to an example of an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing an example of an embodiment of the present invention.

FIG. 3 is an enlarged perspective view showing the vicinity of an end of a shielding electrode according to an example of an embodiment of the present invention.

FIG. 4 is a sectional view showing an electrode structure of an optical recording element previously proposed by the present applicant.

FIG. 5 is a plan view showing an electrode structure of an optical recording element previously proposed by the present applicant.

FIG. 6 is a partially cutaway perspective view of an optical recording element proposed earlier by the present applicant.

FIG. 7 is a perspective view showing a problem in an electrode structure of an optical recording element previously proposed by the present applicant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical recording element 2 Anode substrate 5 Enclosure 6 Light emitting dot 7,8 Light emitting dot row 12,13 Cathode 30,31 Control electrode 60 Shielding electrode 61 Projection

Continuation of the front page (56) References JP-A-8-238794 (JP, A) JP-A-1-299070 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41J 2 / 44

Claims (5)

(57) [Claims] 1. An envelope whose inside is in a high vacuum state, and two light-emitting dot rows comprising a plurality of light-emitting dots arranged on an inner surface of an anode substrate which is a part of the envelope; A control electrode provided along each of the light emitting dot rows on each outer side of each of the light emitting dot rows, and along the light emitting dot rows at a predetermined distance from the anode substrate between the two light emitting dot rows. An optical recording element comprising: a provided shielding electrode; and a filament-shaped cathode provided along each of the light emitting dot rows above each of the light emitting dot rows, wherein the shielding electrode is provided on the anode substrate. On the insulating layer
An optical recording element , wherein both end portions are fixed to a frame, and a projection is formed at an inner bottom portion of the both end portions so as to come into contact with the surface of the anode substrate. 2. The optical recording element according to claim 1, wherein the protrusion contacts the anode substrate in a region where there is no anode wiring connecting the two rows of light emitting dots. 3. The optical recording element according to claim 1, wherein the height of the shielding electrode is higher than the height of the cathode. Wherein said control electrode is the anode are insulated with respect to the substrate, high aspect than its height the cathode 1
The optical recording element as described in the above. The method according to claim 5, wherein the luminous dots, the sequential scanning signals every two luminous dots adjacent staggered between the two rows of light-emitting dot array is applied, the voltage of positive always provided the shielding electrode The optical recording element according to claim 1, wherein a positive selection voltage is applied to one of the two control electrodes in synchronization with the scanning of the light emitting dots, and a negative non-selection voltage is applied to the other. .