475278 A7 B7 五、發明說明（1 ) 發明背景 1 .發明之技術領域 本發明係有關於一種壓電變壓器，特別是有關於一種 結構，其中一壓電變壓器元件係安全地被固定於一外殼中 或是一外殻與一基板之間。 2 .相關技藝之敘述 習用上，產生高電壓之繞圈變壓器被用來作爲冷陰極 管、複印機、靜電去除機等需要高電壓之裝置的升壓電路 。近來，壓電變壓器則被普遍採用。導通與持續發光時的 壓電轉換器之輸出特性特別適合用來點亮作爲液晶顯示器 之被照光的冷陰極管，並且由於其可被製造得很薄，也更 廣獲使用。 習用上，這種壓電變壓器之壓電陶瓷元件係由如圖4 所示之結構所支撐。變壓器元件4 0包括一壓電陶瓷平板 ，並且在其中心位置由支撐陶瓷基體4 6所支撐。爲了避 免元件在掉落或遭到撞擊時受到彎曲而產生損壞，彈性基 體護墊4 8被提供於基板4 2與外殻4 4上，而面對壓電 陶瓷元件的較長邊。 在這種支撐結構中，壓電陶瓷元件與外殼以及基板之 間的空隙必須非常窄，以降低高度並且減小黏合面積。因 此，極可能產生外殻與壓電陶瓷元件碰觸的危險。 再者，低損耗功率由於能夠延長電池之使用壽命，近 來受到重視，而且脈衝寬度調變（p u 1 s e w i d t h m 〇 d u 1 a t i ο η， 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填頁) -------訂---------線· -· 經濟部智慧財產局員工消費合作社印製 -4- 475278 A7 B7 五、發明說明（2 ) PWM )光控制方法開始被用來點亮冷陰極管。P W Μ光控 制頻率也被應用於壓電變壓器的驅動頻率。光控制頻率爲 數百赫（Η ζ )，其係爲低於數百千赫（k Η ζ )之驅動 頻率的可聽辨頻率。因此，當元件碰觸外殼時，便產生了 被稱作「抖動聲響」（trembling sound )的雜音。 本發明提供一種支撐結構，其可避免壓電陶瓷元件於 掉落或受到撞擊時被損壞，而不必減少其震動。此外，本 發明提供一種支撐結構’其可藉由最小化壓電陶瓷元件與 外殼以及類似者之間的空隙而被製造得很薄，並且避免由 光控制訊號所產生的雜音。 發明之槪述 本發明藉由提供多重薄彈性緩衝墊於壓電元件之震動 點處，以支撐外殻與基板，而解決上述問題。 在藉由一外殼或一外殼與一基板以固定壓電陶瓷元件 的壓電變壓器中，多重環狀彈性緩衝墊被環繞於壓電陶瓷 平板上，而且該環狀彈性緩衝墊保持與外殼或者外殼以及 基板之間的空隙；可替代地，多重薄片彈性緩衝墊被提供 於外殼的內側，而且該薄片彈性緩衝墊保持與外殻之間的 空隙。 該環狀與薄片彈性緩衝墊可具有一約爲0 · 2至 〇 . 4 m m的厚度/直徑。因此，此距離之空隙可被保持 ，避免外殻碰觸壓電陶瓷元件，而且避免壓電陶瓷元件於 受到撞擊或類似者時所產生的彎曲。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填 i頁： ------訂-------1^ 經濟部智慧財產局員工消費合作社印制衣 -5- 475278 A7 ___B7 __ 五、發明說明（3) 圖式之簡要說明 本發明之上述目的、精神與優點，藉由下列參照附圖 所作之較佳具體實施例的詳細描述，將會更爲明白，其中 圖1繪示本發明之一具體實施例的圖解； 圖2繪示本發明之一具體實施例的橫截面圖； 圖3繪示本發明之另一具體實施例的圖解；以及 圖4繪示習用之壓電變壓器的橫截面圖。 經濟部智慧財產局員工消費合作社印製 主要元件對照表 1 0 壓 電 陶 瓷 元 件 1 2 基 板 1 4 外 殻 1 5 環 狀 彈 性 基 體 1 6 支 撐 彈 性 基 體 3 〇 壓 電 陶 瓷 元 件 3 4 外 殼 3 5 樹 脂 彈 性 基 體 4 〇 變 壓 器 元 件 4 2 基 板 4 4 外 殼 4 6 支 撐 彈 性 基 體 4 8 彈 性 基 體 護 墊 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 475278 A7 ---一—__B7____ 五、發明說明（4 ) 具體實施例之描述 本發明之參考具體實施例將藉由參照圖式而被說明。 圖1係爲本發明之一具體賓施例的圖解。一壓電陶瓷 元件1 0係由一例如印刷電路板之基板1 2、以及外殼 1 4所環繞。環狀彈性緩衝墊（以下稱作「環狀彈性基體 」）1 5則纒繞於壓電陶瓷元件1 0之兩個部位。這些環 狀彈性基體1 5包括具有約爲0 . 3 m m之直徑的橡膠或 樹脂所構成的環狀基體，並且環繞壓電陶瓷元件1 0之震 動點處於其四分之一與四分之三長的位置上。 圖2係爲組成結構之橫截面圖。外殻1 4被接合至基 板1 2，而且環狀彈性基體1 5隔著一個空隙被提供於基 板1 2、外殼1 4與壓電陶瓷元件1 0之間。如上所述， 由於環狀彈性基體1 5被提供於相對於中心點等距離的位 置，並且位於中心點與兩端之間，使得空隙可以被穩定地 保持。 壓電陶瓷元件1 0被一支撐彈性基體1 6所安全地固 定，該支撐彈性基體1 6被提供於基板1 2的中間，以將 環狀彈性基體1 5定位。該支撐彈性基體1 6可被提供於 外殼之內凹處或是固定於基板上。 圖3繪示本發明之另一具體實施例的圖解，其中樹脂 彈性基體3 5被固定於外殼3 4內部’或者類似上述環狀 物之彈性基體係藉由使用習用之鑄模方法而被形成，並且 被提供於壓電陶瓷元件3 0處。 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） (請先閱讀背面之注意事項再填^^頁) · --線- 經濟部智慧財產局員工消費合作社印制π 475278 A7 ______B7___ 五、發明說明（5 ) 本發明並不侷限於上述之範例，彈性基體的位置與數 目可根據壓電陶瓷元件的震動模態而被選定。此外，對於 彈性基體的材料與形狀亦沒有任何的限制。 根據本發明，習用上所需之介於壓電陶瓷元件與外殼 之間的1 · 0 m m空隙可被減少至大約〇 · 3 m m。另外 ，如此可避免壓電陶瓷元件碰觸外殼與其類似者。由於光 控制訊號所產生的雜音也可被避免。 因此’該裝置之厚度可被減小，因而可以縮小黏合之 面積。 最後，由於震動點可獲得支撐，震動不會受到限制， 輸出也不會因而減小。由於中心點與兩端之間的位置可被 支撐，如此可以避免元件在掉落或受到撞擊之後受到彎曲 或損壞，使得損害避免元件的數量可以減少。 本發明之圖式與描述以較佳實施例說明如上，僅用於 藉以幫助了解本發明之實施，非用以限定本發明之精神， 而熟悉此領域技藝者於領悟本發明之精神後，在不脫離本 經濟部智慧財產局員工消費合作社印製 替領 化同 變等 之其 等及 同圍 及範 飾利 潤專 動請 更申 許之 些附 作後 可視 當當 ’ 圍 內範 圍護 範保 神利 精專 。 之其定 明，而 發換域 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） -8 -475278 A7 B7 V. Description of the invention (1) Background of the invention 1. Field of the invention The present invention relates to a piezoelectric transformer, and more particularly to a structure in which a piezoelectric transformer element is securely fixed in a casing. Or between a casing and a substrate. 2. Description of related arts In practice, winding transformers that generate high voltage are used as booster circuits for high-voltage devices such as cold cathode tubes, copiers, and static removers. Recently, piezoelectric transformers are widely used. The output characteristics of the piezoelectric converter during conduction and continuous light emission are particularly suitable for lighting a cold-cathode tube that is illuminated as a liquid crystal display, and because it can be made thin, it is more widely used. Conventionally, the piezoelectric ceramic element of this piezoelectric transformer is supported by the structure shown in FIG. 4. The transformer element 40 includes a piezoelectric ceramic plate and is supported at its center by a supporting ceramic substrate 46. In order to prevent the element from being damaged due to bending when it is dropped or hit, an elastic substrate pad 48 is provided on the substrate 42 and the case 44, and faces the longer side of the piezoelectric ceramic element. In such a support structure, the gap between the piezoelectric ceramic element, the housing, and the substrate must be very narrow to reduce the height and reduce the bonding area. Therefore, there is a high risk that the case will contact the piezoelectric ceramic element. In addition, low-loss power has recently been valued because it can prolong battery life, and the pulse width modulation (pu 1 sewidthm 〇du 1 ati ο η), this paper size applies Chinese National Standard (CNS) A4 specifications (210 X 297 (Mm) (Please read the precautions on the back before filling in the page) ------- Order --------- Line ·-· Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs -4- 278278 A7 B7 V. Description of the Invention (2) PWM) The light control method is used to light up the cold cathode tube. The PWM light control frequency is also applied to the driving frequency of the piezoelectric transformer. The light control frequency is several hundred hertz (Η ζ), which is an audible frequency that is lower than the driving frequency of several hundred kilohertz (k Η ζ). Therefore, when a component touches the housing, a noise called a trembling sound is generated. The invention provides a supporting structure, which can prevent the piezoelectric ceramic element from being damaged when it is dropped or impacted, without reducing its vibration. In addition, the present invention provides a supporting structure 'which can be made thin by minimizing a gap between a piezoelectric ceramic element and a housing and the like, and avoids noise generated by a light control signal. Summary of the Invention The present invention solves the above problems by providing multiple thin elastic cushions at the vibration points of the piezoelectric element to support the housing and the substrate. In a piezoelectric transformer in which a piezoelectric ceramic element is fixed by a casing or a casing and a substrate, a multiple annular elastic cushion is surrounded on a piezoelectric ceramic plate, and the annular elastic cushion is held with the casing or casing And a gap between the substrates; alternatively, a multi-sheet elastic cushion is provided on the inside of the case, and the sheet elastic cushion maintains a gap with the case. The ring-shaped and sheet elastic cushion may have a thickness / diameter of about 0.2 to 0.4 mm. Therefore, the gap at this distance can be maintained to prevent the case from touching the piezoelectric ceramic element, and avoid bending of the piezoelectric ceramic element when it is impacted or the like. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) (Please read the notes on the back before filling in page i: ------ Order ------- 1 ^ Ministry of Economy Intellectual Property Bureau, printed clothing for consumer cooperatives -5- 475278 A7 ___B7 __ V. Description of the invention (3) Brief description of the above-mentioned objects, spirits and advantages of the present invention. The detailed description of the examples will be more clearly understood, in which FIG. 1 shows a diagram of a specific embodiment of the present invention; FIG. 2 shows a cross-sectional view of a specific embodiment of the present invention; and FIG. 3 shows another embodiment of the present invention. A schematic diagram of a specific embodiment; and FIG. 4 shows a cross-sectional view of a conventional piezoelectric transformer. The comparison table of the main components printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 1 0 Piezoceramic components 1 2 Substrate 1 4 Housing 1 5 Ring-shaped elastic base 1 6 Supporting elastic base 3 〇 Piezoceramic element 3 4 Housing 3 5 Resin elastic base 4 〇 Transformer element 4 2 Substrate 4 4 Housing 4 6 Supporting elastic base Body 4 8 Elastic substrate pad This paper size is applicable to Chinese National Standard (CNS) A4 specification (210 X 297 mm) 475278 A7 --- --- __B7____ 5. Description of the invention (4) Description of specific embodiments Reference of the invention The specific embodiment will be explained by referring to the drawings. FIG. 1 is a diagram illustrating a specific embodiment of the present invention. A piezoelectric ceramic element 10 is composed of a substrate 1 2 such as a printed circuit board, and a housing 1. Surrounded by 4. Ring-shaped elastic cushions (hereinafter referred to as "ring-shaped elastic substrates") 15 are wound around two parts of the piezoelectric ceramic element 10. These ring-shaped elastic substrates 15 include approximately 0. A ring-shaped substrate made of rubber or resin with a diameter of 3 mm, and the vibration point surrounding the piezoelectric ceramic element 10 is at one-quarter and three-quarters of its length. Figure 2 shows the horizontal structure of the structure A cross-sectional view. The case 14 is bonded to the substrate 12 and the ring-shaped elastic base 15 is provided between the substrate 1 2, the case 14, and the piezoelectric ceramic element 10 through a gap. As described above, since The annular elastic base 15 is provided with respect to the center point, etc. Distance, and is located between the center point and the two ends, so that the gap can be stably maintained. The piezoelectric ceramic element 10 is securely fixed by a supporting elastic base 16 which is provided on the substrate The middle of 1 2 is used to position the ring-shaped elastic base 15. The supporting elastic base 16 can be provided in the inner recess of the housing or fixed on the substrate. FIG. 3 is a diagram illustrating another embodiment of the present invention, in which a resin elastic base 35 is fixed inside the housing 34, or an elastic base system similar to the above-mentioned ring is formed by using a conventional molding method, And it is provided at the piezoelectric ceramic element 30. This paper size is in accordance with China National Standard (CNS) A4 (210 X 297 mm) (Please read the notes on the back before filling in ^^ pages) · --- Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 ______B7___ 5. Explanation of the invention (5) The present invention is not limited to the above-mentioned examples. The position and number of the elastic substrate can be selected according to the vibration mode of the piezoelectric ceramic element. In addition, there are no restrictions on the material and shape of the elastic substrate. According to the present invention, a gap of 1.0 mm between the piezoelectric ceramic element and the case, which is conventionally required, can be reduced to about 0.3 mm. In addition, this can prevent the piezoelectric ceramic element from touching the housing and the like. Noise due to light control signals can also be avoided. Therefore, the thickness of the device can be reduced, and the area of adhesion can be reduced. Finally, since the vibration point can be supported, the vibration will not be limited and the output will not be reduced accordingly. Since the position between the center point and both ends can be supported, this can prevent the component from being bent or damaged after being dropped or impacted, so that the number of damage avoidance components can be reduced. The drawings and description of the present invention are described above in the preferred embodiments, and are only used to help understand the implementation of the present invention. They are not intended to limit the spirit of the present invention. Those skilled in the art will appreciate the spirit of the present invention after Without departing from the Intellectual Property Bureau of the Ministry of Economic Affairs, the consumer co-operative society prints the replacement of the same as the change, and the profit of the circle and the fan decoration. Li Jingzhuan. It is specified, and the domain is changed. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -8-