CN-122007006-A - Ultrasonic device, overlapping conveyance detection device, conveyance device, and scanner

Abstract

The present invention provides an ultrasonic device which makes foreign matter less likely to adhere to a transmission/reception surface of ultrasonic waves, and which can transmit ultrasonic waves at high sound pressure or receive ultrasonic waves at high sensitivity, an overlapping conveyance detection device which is provided with the ultrasonic device and can detect overlapping conveyance with high accuracy, a conveyance device which is provided with the overlapping conveyance detection device, and a scanner which is provided with the conveyance device. An ultrasonic device is provided with an ultrasonic element having a transmission/reception surface for performing at least one of transmission and reception of ultrasonic waves, and a housing for housing the ultrasonic element, wherein the housing has a reflection surface for reflecting the ultrasonic waves, a waveguide for transmitting the ultrasonic waves, and an opening provided at one end of the waveguide for the ultrasonic waves to pass through, and the length of the waveguide is longer than the width of the waveguide.

Inventors

• TOMIOKA HIROTO
• Hillside plot is prosperous good
• IZUO SEIJI

Assignees

• 精工爱普生株式会社

Dates

Publication Date

20260512

Application Date

20251110

Priority Date

20241111

Claims (15)

1. 1. An ultrasonic device, comprising: an ultrasonic element having a transmitting/receiving surface for transmitting/receiving ultrasonic waves and at least one of the ultrasonic waves, and A housing which houses the ultrasonic element, The housing has: a reflection surface that reflects the ultrasonic wave; A waveguide for propagating the ultrasonic wave, and An opening portion provided at one end of the waveguide for the ultrasonic wave to pass through, The length of the waveguide is longer than the width of the waveguide.
2. 2. The ultrasonic device according to claim 1, wherein, When the length of the waveguide is L, the propagation angle of the ultrasonic wave propagating through the waveguide is α, and the wavelength of the ultrasonic wave is λ, the following expression is satisfied: , in the above formula, k is an integer.
3. 3. The ultrasonic device according to claim 1, wherein, The width of the waveguide is 1/5 or less of the length of the waveguide.
4. 4. The ultrasonic device according to claim 1, wherein, The reflecting surface is arranged on the vertical line of the transmitting and receiving surface.
5. 5. The ultrasonic device according to claim 1, wherein, The reflecting surface is arranged midway in the waveguide, The waveguide has: a first portion extending from the ultrasonic element to the reflecting surface along a perpendicular to the transmitting/receiving surface, and A second portion extending from the reflecting surface to the opening along a perpendicular line to the opening, The length of the first portion in the extending direction of the perpendicular line of the transmitting/receiving surface is longer than the width of the first portion, The second portion has a length in the extending direction of the perpendicular line of the opening portion longer than a width of the second portion.
6. 6. The ultrasonic device of claim 5, wherein, The normal line of the reflection surface is inclined with respect to both the perpendicular line of the transmission/reception surface and the perpendicular line of the opening.
7. 7. The ultrasonic device of claim 6, wherein, The perpendicular line of the transmitting/receiving surface and the perpendicular line of the opening are inclined in opposite directions with respect to each other across the normal line of the reflecting surface.
8. 8. The ultrasonic device of claim 7, wherein, The perpendicular line of the transmitting/receiving surface and the perpendicular line of the opening intersect each other on the reflecting surface.
9. 9. The ultrasonic device of claim 5, wherein, The perpendicular line of the opening is inclined with respect to an object to be irradiated with the ultrasonic wave.
10. 10. The ultrasonic device according to claim 1, wherein, The housing has a first discharge hole provided at a position different from the opening.
11. 11. The ultrasonic device of claim 10, wherein, The housing has a second discharge hole provided at a position different from the opening portion and the first discharge hole.
12. 12. The ultrasonic device of claim 10, wherein, The ultrasonic device has a mesh-shaped protective member provided in the opening.
13. 13. An overlapping conveyance detection device is characterized by comprising: an ultrasonic device for transmission, which is an ultrasonic device according to any one of claims 1 to 12, and which transmits ultrasonic waves to the transmitting/receiving surface of the ultrasonic device for transmission, and An ultrasonic device for reception, which is the ultrasonic device according to any one of claims 1 to 12, wherein the transmitting/receiving surface of the ultrasonic device for reception receives the ultrasonic wave, The transmitting ultrasonic device and the receiving ultrasonic device are disposed across a medium conveyance path, The ultrasonic wave is transmitted from the transmitting ultrasonic device, the ultrasonic wave having passed through the medium is received by the receiving ultrasonic device, and the overlapping conveyance of the medium is detected based on the intensity of the received signal.
14. 14. A conveying device is characterized in that, The conveying apparatus includes the overlapping conveyance detecting apparatus according to claim 13, The conveying device conveys the medium along a conveying path of the medium.
15. 15. A scanner, which comprises a scanner body and a scanning head, characterized by comprising: The delivery device of claim 14, and And a reading unit that reads an image carried by the medium.

Description

Ultrasonic device, overlapping conveyance detection device, conveyance device, and scanner Technical Field The present invention relates to an ultrasonic device, an overlapping conveyance detection device, a conveyance device, and a scanner. Background Patent document 1 discloses an ultrasonic device that detects overlapping conveyance of sheets using an ultrasonic device. The ultrasonic device includes a pair of ultrasonic devices disposed across a paper transport path. An ultrasonic wave is transmitted from one ultrasonic device, and an ultrasonic wave transmitted through the sheet is received by the other ultrasonic device. This makes it possible to realize a sheet conveying apparatus for a scanner capable of detecting a plurality of sheets simultaneously fed based on the intensity of a reception signal of ultrasonic waves. Patent document 1 discloses that an ultrasonic device is disposed in a shielding portion having an opening, and that a mesh-like protective member for suppressing intrusion of foreign matter is provided in the opening through which ultrasonic waves pass. Patent document 1 Japanese patent application laid-open No. 2020-25242 However, the ultrasonic device of patent document 1 has room for improvement. Specifically, when the mesh is thick, foreign matter such as paper dust passing through the protective member adheres to the surface of the ultrasonic device, and there is a problem in that the sensitivity of transmitting and receiving ultrasonic waves is lowered. Further, if the mesh is made thin, when cleaning foreign matter adhering to the surface of the protective member with the cleaning liquid, the moisture of the cleaning liquid is mixed with paper dust and easily adheres to the protective member, and there is a problem that the sensitivity of transmitting and receiving ultrasonic waves is lowered. Accordingly, an ultrasonic device is demanded in which foreign matter is less likely to adhere to the ultrasonic transmission/reception surface and which can transmit ultrasonic waves with high sound pressure or receive ultrasonic waves with high sensitivity. Disclosure of Invention An ultrasonic device according to an application example of the present invention includes an ultrasonic element having a transmitting/receiving surface for transmitting/receiving ultrasonic waves, and a housing for housing the ultrasonic element, wherein the housing includes a reflecting surface for reflecting the ultrasonic waves, a waveguide for transmitting the ultrasonic waves, and an opening provided at one end of the waveguide for the ultrasonic waves to pass through, and the length of the waveguide is longer than the width of the waveguide. The overlapping conveyance detection device according to the application of the present invention includes a transmission ultrasonic device that is an ultrasonic device according to the application of the present invention, the transmission/reception surface of the transmission ultrasonic device transmitting ultrasonic waves, and a reception ultrasonic device that is an ultrasonic device according to the application of the present invention, the transmission/reception surface of the reception ultrasonic device receiving the ultrasonic waves, the transmission ultrasonic device and the reception ultrasonic device being disposed across a conveyance path of a medium, the ultrasonic waves being transmitted from the transmission ultrasonic device, the ultrasonic waves having passed through the medium being received by the reception ultrasonic device, and overlapping conveyance of the medium being detected based on the intensity of a reception signal. The conveying device according to the application of the present invention includes the overlapping conveyance detecting device according to the application of the present invention, and conveys the medium along the conveyance path of the medium. The scanner according to the application example of the present invention includes the transport device according to the application example of the present invention, and a reading unit that reads an image carried by the medium. Drawings Fig. 1 is a perspective view of a scanner according to a first embodiment as viewed from the front. Fig. 2 is a side sectional view showing an original conveying path of the scanner of fig. 1. Fig. 3 is a block diagram showing the configuration of a control system of the scanner of fig. 1. Fig. 4 is a side cross-sectional view showing the structure of the double feed detection device. Fig. 5 is a side sectional view showing the structure of the ultrasonic device. Fig. 6 is a perspective view of the main board and the like shown in fig. 5. Fig. 7 is a side sectional view of a main portion of the ultrasonic element shown in fig. 6. Fig. 8 is a diagram showing a model simulating a waveguide included in the ultrasonic device of fig. 5. Fig. 9 is a simulation result obtained by three-dimensionally analyzing the sound pressure distribution in a plane inte